P-Bus Gateway Firmware PBGW2.128 Version 1.61

P-Bus Gateway
Firmware
PBGW2.128
Version 1.61
• Easy configuration with web interface (HTML)
• P-busses configurable separately in master or slave mode
• Status display of each P-bus
• Fixed IP address or dynamic with DHCP (configurable)
• Modbus RTU data communication over RS-232, RS-485 and TCP / IP
• Status display of all I/O-modules on P-Bus
• Open communication to third party systems
PCS0113en
02.2009
Persy Control Services B.V.
Netherlands

General
The gateway is being configured by means of a web interface (HTML). Use a
standard web browser ie. MSIE5.5 or higher.
If you have more than one PC, you must use an external hub. Connect the
Ethernet port on the gateway (X6) to a port on the hub using a straight through
Ethernet cable. If you only have one PC, you can connect the gateway to the PC
directly without a hub. For a single PC, connect the Ethernet port on the gateway
(X6) to the Network Adapter on the PC using a crossover cable (red tag).
Make sure that the PC is configured in the same subnet as the gateway is.
Go to the Network Connections of your PC from the Control Panel.
Make sure the LAN connection to which the gateway is connected is disabled. If
not, right click on the LAN connection and choose ‘disable’.
Now, right click on the LAN connection and choose ‘properties’.
In the next window select Internet Protocol (TCP/IP) and click ‘Properties’.
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Select ‘Use the following IP address:’ and use the following settings:
IP address 192.168.1.1 (last digit could range from 1-253)
Subnet mask 255.255.255.0
Now click OK to confirm these settings. Click OK again in the next window.
Establish a connection by double clicking the LAN connection in the Network
Connections Window.
Factory defaults
The standard IP settings (factory default) of the gateway are:
IP address 192.168.1.254
Subnet mask 255.255.255.0
When the gateway isn’t reachable (anymore) over TCP / IP or the configuration
isn’t desirable somehow, it can be set back to factory defaults.
Follow the next procedure in order to set the gateway to factory defaults:
1. Interrupt the gateway’s power supply by unplugging the screw terminal X1
2. Press the RESET-button and keep it pressed
3. Power up the gateway by plugging in the screw terminal X1
4. Keep pressing the RESET-button until the STATUS-led is off
5. Release the RESET-button
NOTE:
When the gateway is set back to factory defaults, all settings are lost.
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Device configuration
System Overview
Open the web browser and type the IP address of the gateway in the URL field of
the browser. The following page will show (System Overview):
In the upper right corner of the page you can find the current Firmware version in
the gateway (see also “Firmware upgrade”).
On the left is the navigation panel. You can navigate to a page by clicking on the
corresponding menu item in the panel. The page is being reloaded and the active
item is printed bold in the menu. As you can see in the example above we are
currently in the ‘System Overview’. This page displays the present status and
configuration of the gateway. To make changes in the configuration navigate to the
corresponding subject in the navigation panel.
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Device Setup
TCP / IP Settings
NOTE:
In this page you can make changes in the TCP / IP communication settings. The
Physical Address (or MAC address) is unique for each device and can be used by
the DHCP server to identify the gateway and to assign it a reserved IP address.
When the gateway is configured in a network containing a DHCP server, and you
want the DHCP server to configure the gateway’s IP address and Subnet mask,
check the checkbox next to ‘DHCP Enabled’.
If you want to manually specify the IP address and Subnet mask, uncheck the
checkbox next to ‘DHCP Enabled’. The fields ‘IP Address’ en ‘Subnet mask’ will
become active and the addresses can be filled in here.
To apply the settings click ‘Apply Settings’. The settings will be saved to the nonvolatile
memory and the gateway will restart. After restart you’ll have to reconnect
to the gateway by specifying the new IP address in the URL field at the top of the
browser.
If you want to discard the settings click ‘Discard Settings’. The same result can be
achieved by reloading the page.
!! When applying the settings (‘Apply Settings’) all communications could be
interrupted temporarily.
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Device Setup
Port Settings
In this page you can make changes in the RS-232 and RS-485 configuration. This
configuration is being applied to the Modbus RTU protocol when enabled in the
Modbus RTU Server Protocol Settings. Match these settings to the device the
gateway communicates with (Modbus Client).
The possible settings are:
Baudrate: 110, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
Databits: 8
Parity: None, Even, Odd
Stopbits: 1, 2
Handshaking: None, RTS/CTS
The factory defaults for RS-232 are: 9600, 8, N, 1, No Handshaking
The factory defaults for RS-485 are: 9600, 8, N, 1.
If RTS/CTS handshaking is used with RS-232, pin 7 & 8 of the DSUB-9 connector
(X5) have to be connected also.
NOTE:
!! When applying the settings (‘Apply Settings’) all communications could be
interrupted temporarily.
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P-Bus
Settings (1)
In this page you can make changes to the P-bus configuration.
At ‘Configured Operating Mode’ you can choose the operating mode for the
corresponding P-bus. The possible operating modes are: ‘Slave’ and ‘Master’.
At ‘Current Operating Mode’ the current operating mode of the corresponding P-
bus is being displayed.
Choose Slave mode if the corresponding P-bus has already a master controller
(Siemens PRU/PRV or PX) attached to it. In this mode the gateway depends on the
master controller which also provides the reference voltage on the PU-line. The
gateway will act as a slave on the P-bus. The green led ‘MASTER’ above the P-bus
connector (X2 or X3) is off in this mode.
Choose Master mode if you want the corresponding P-bus of the gateway to act as
a master controller on the P-bus. The reference voltage on the PU-line will then be
provided by the gateway. The green led ‘MASTER’ above the P-bus connector (X2
or X3) is on in this mode.
To protect external equipment and the gateway itself, the reference voltage is
switched on only when the gateway doesn’t detect any reference voltage on the
PU-line. If the gateway does detect a reference voltage on the PU-line, it will
configure the particular P-bus automatically in slave mode. This could lead to a P-
bus configured in master mode displaying the Current Operating Mode as SLAVE.
In this case, check if there is a master controller already present on the P-bus.
At ‘I/O-Modules’ the number of slaves (I/O-modules) currently detected on the P-
bus is being displayed.
When ‘Overload’ displays YES, this means that there are too many load units
detected on the P-bus. In this case, reduce the number of slaves on the P-bus.
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P-Bus
Settings (2)
NOTE:
Each P-bus can handle a maximum of 64 load units. For the gateway in total (2x64)
the maximum is 128 load units. The buffer in the gateway has space for a
maximum of 127 slaves per P-bus in the range of address 1..127.
!! When applying the settings (‘Apply Settings’) all communications could be
interrupted temporarily.
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P-Bus
Modulelist (1)
.
This page displays the status of all I/O-modules on the P-Bus. Each module-type is
being displayed with the module-address number in front. By mouse-click on the +
sign the module expands and all I/O-channels become visible:
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P-Bus
Modulelist (2)
To expand all modules at once simply click ‘expand all’:
The value / status of each I/O-channel is displayed depending on the module type
as measurement, command, input or control-output followed by the standard unit.
The LG Ni-1000 modules PTM1.*R1K are displayed as -50 .. 150 °C
n.c. = not connected
M = manual control
short-circuit = input is short-circuited
By clicking on ‘collapse all’ all I/O-modules are collapsed to their initial state.
By default, the I/O-modules being displayed are those which are actually on the P-
Bus (‘hide empty modules’). To show all I/O-addresses (also the unused
addresses) click ‘show empty modules’.
In order to switch the display to P-Bus 2 navigate by clicking on P-Bus 2 in the
navigation bar:
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P-Bus
Virtual Modules (1)
Open communication through the P-Bus gateway is possible by making use of
‘virtual modules’. These virtual modules are fictitious modules which are read by
the system-controller if the corresponding P-Bus is configured as SLAVE. The
modules are read as if they were really present at the P-Bus.
The data fed to these virtual modules is coming from the modbus-registers in the
gateway. In this manner an open communication path is created between the
system-controller and an open DDC system by means of modbus-communication.
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P-Bus
Virtual Modules (2)
In this picture an example is shown in which a communication-link is created with a
PRU / PRV through the P-Bus gateway. The PRU / PRV communicates with the
I/O-modules via P-Bus. The P-Bus of the gateway is configured as SLAVE and is
also visible by the PRU / PRV. In the virtual module-list fictive I/O-modules can be
configured which are provided with information by the universal DDC controller.
Click ‘add’ to create a new virtual module:
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P-Bus
Virtual Modules (3)
In the left column the fictive module address can be configured.
By clicking on the module-type in the right column the type can be configured.
A listbox is being shown in which you can choose from all available PTM-..
moduletypes. Choose the desired type.
The delete a module move the indicator in the most left column to the module you
wish to delete by clicking in the empty square. Click ‘delete’.
To delete all modules click ‘clear all’.
If all desired virtual modules are entered into the table you need to store the table
into the gateway’s non-volatile memory by clicking ‘apply’.
If you wish to discard the changes you made in the table click ‘discard’.
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Modbus RTU Server
Protocol Settings
In this page you can make changes to the Modbus communication configuration.
A Modbus RTU connection can be established over each of the 3 electrical
interfaces: RS-232, RS-485 and Ethernet (TCP/IP). It’s recommended to use one
connection at the same time. Check the checkbox next to Enabled of the electrical
interface you want to use and uncheck the other two.
At RS-232 and RS-485 you can specify a ‘Slave-address’. This is the modbus
slave address the gateway will respond to at modbus requests form a modbus
client.
Also the modbus inter-frame timeout can be specified. If the checkbox before ‘Auto’
is checked, the gateway will calculate the inter-frame timeout automatically. In most
cases this auto timeout is sufficient for reliable communication.
Sometimes it’s desirable to manually specify the inter-frame timeout to be able to
adjust the value to the connected client. For example if the client drops out in the
middle of a modbus frame for a long period of time, the frames don’t always survive
intact when they’ve reached the gateway. This could lead to frame-errors and
delays in the communication. In this case uncheck the checkbox before ‘Auto’ and
specify the inter-frame timeout in the field next to it (in tenths of milliseconds).
Under ‘Modbus on TCP/IP’ you can specify the TCP Port number at which the
gateway listens for modbus requests. Match this to the Port number at which the
modbus client sends out its requests. The default TCP Port for modbus
communications and also the gateway’s factory default is 502.
NOTE:
!! When applying the settings (‘Apply Settings’) all communications could be
interrupted temporarily.
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ModBus Registers
Each PTM I/O-module contains 9 registers (16-bit). There are 4 read registers, 4
write registers and 1 register to identify the moduletype. The interpretation of the
read and write registers depends on the moduletype. For example: a digital output
module (PTM1.2Q250) with 2 relay outputs just needs 2 bits (0 or 1) of one register
to indicate if a relay is on or off. An analog input module (PTM1.4R1K) with 4 inputs
uses one register for each A/D converter (input). A detailed description of the I/O
module’s register contents can be found in the documents: PCS013x to PCS018x.
The P-bus Gateway is a transparent gateway. This means: all of the I/O-module’s
registers are identically matched on modbus level. With use of holding registers or
input registers the register contents of every I/O-module can directly be read or
written to.
modbus functions
The following modbus functions are supported by the gateway:
Function Code
Modbus Function
Dec. Hex. Description
3 0x03 READ HOLDING REGISTERS
4 0x04 READ INPUT REGISTERS
6 0x06 WRITE SINGLE REGISTER
16 0x10 WRITE MULTIPLE REGISTERS
There’s no distinction being made between input registers and holding registers.
So the modbus functions 3 and 4 will always have the same result.
register mapping
The general mapping of the modbus registers is as follows:
Dec. Hex. Description
0 – 0x0000 – Diagnostic functions of the gateway
255 0x00FF
256 –
511
512 –
2559
2560 –
2815
0x0100 –
0x01FF
0x0200 –
0x09FF
0x0A00 –
0x0AFF
Moduletype Registers PBUS 1
Register 256 matches the moduletype at moduleaddress 0.
Register 257 matches the moduletype at moduleaddress 1.
etc, etc..
Read/Write Registers PBUS 1
Per I/O-module:
4 read registers
4 write registers
Register 512-515 matches read register 0-3 of module 0.
Register 516-519 matches write register 0-3 of module 0.
Register 520-523 matches read register 0-3 of module 1.
Register 524-527 matches write register 0-3 of module 1.
etc, etc..
Moduletype Registers PBUS 2
Mapping in the same manner as for PBUS 1
2816 –
4863
0x0B00 –
0x12FF
Read/Write Registers PBUS 2
Mapping in the same manner as for PBUS 1
Only the I/O module write registers are writable (modbus functions 6 and 16). All
other registers are read-only.
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Calculating example
If you want to calculate the modbus register offset Y to control an I/O Module at
address A then:
for P-Bus 1: Y = 512 + A * 8
and
for P-Bus 2: Y = 2816 + A * 8
in which the registers:
Y + 0 to Y + 3 are the read registers 0 – 3 of the I/O Module at address A and
Y + 4 to Y + 7 are the write registers 0 – 3 of the I/O Module at address A.
Now, suppose you’ll want to control an I/O Module at address 7 on P-Bus 2 then:
Y = 2816 + 7 * 8 = 2872.
The read registers 0 – 3 of the I/O Module at address 7 are: 2872 – 2875 and
The write registers 0 – 3 of the I/O Module at address 7 are: 2876 – 2879.
An easy tool for calculating the modbus-addresses is available on our website:
www.persy.nl and can be found under document number: PCS018x
diagnostic functions
Detailed mapping of the diagnostic functions:
Dec. Hex. Description
0 0x00 Device Status
1 – 7 0x01 – 0x07 Not used
8 0x08 PBUS 1 Current Operating Mode
9 0x09 PBUS 1 Error Status
10 0x0A PBUS 1 Number of I/O Modules present
11 0x0B PBUS 1 Number of load units present
12 – 15 0x0C – 0x0F Not used
16 0x10 PBUS 2 Current Operating Mode
17 0x11 PBUS 2 Error Status
18 0x12 PBUS 2 Number of I/O Modules present
19 0x13 PBUS 2 Number of load units present
20 – 255 0x14 – 0xFF Not used
Device Status:
0 = normal operations
1 = firmware upgrade mode
2 = reset
3 = hardware failure, gateway need to be reset or exchanged
PBUS Current Operating Mode:
0 = not used
1 = slave
2 = master
PBUS Error Status:
Bit Description
0 Set = general failure, gateway need to be reset or exchanged
1 Set = overload
2..15 not used
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Firmware upgrade
The firmware in the gateway can be upgraded. New firmware releases will be
offered to you on our website or can be ordered by mail and keep your product upto-date.
The upgrade is done by use of a SD card. If you have downloaded the firmware
from our website you can copy it to a SD card with a PC equipped with a cardreader/writer.
Check if the SD card is formatted with the FAT16 (or FAT) file
system. Only SD cards with a capacity between 32MB and 2GB are supported.
Copy the firmware file ‘PBGW2128.BIN’ into the root folder of the SD card. If the
firmware file is placed in a sub folder the gateway will not respond to it. To upgrade
the gateway follow the next procedure:
1. Place the SD card with the firmware in the SD slot of the gateway.
2. Press the RESET-button until the STATUS-led starts blinking.
3. The gateway is now ready for the upgrade. Release the RESET-button.
4. Firmware upgrade process has started. Wait until the STATUS-led is off.
The upgrade process takes approximately 2 minutes. During the process the
STATUS-led will blink rapidly. On completion of the upgrade the gateway will
restart and the STATUS-led will go off.
If the STATUS-led doesn’t start blinking in step 2 this means that:
- the gateway couldn’t find the firmware file ‘PBGW2128.BIN’ in the root
folder of the SD card Copy the firmware file into the root folder
- the firmware file on the SD card is corrupted Download the file again
from our website and copy it onto the SD card
- the gateway can’t handle the file system on the SD card Format the SD
card with the FAT16 file system and copy the firmware file onto it
- the SD card isn’t properly placed in the SD slot Take the SD card out
and place it back again in the SD slot of the gateway
Warning!
!! Never switch off the gateway or interrupt its power supply during the firmware
upgrade process (rapidly blinking STATUS-led) !!
Switching off the gateway or interrupting its power supply during the upgrade
process can permanently damage the gateway.
NOTE:
During the upgrade process the normal functions of the gateway are interrupted.
Data communication over RS-232, RS-485, Ethernet and P-bus is not possible.
© 2009 Persy Control Services B.V.
www.persy.nl
Subject to changes
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