P-Bus Gateway PBGW2.128

P-Bus Gateway
PBGW2.128
Universal gateway between the P-bus protocol and open standard
protocols. The variety of available electrical interfaces on the gateway offers
a wide range of possibilities for connections to various hardware.
• Compatible with Siemens DDC equipment
• 2 P-bus connections for a total of 128 load units
• Standard RS-232, RS-485 and Ethernet connections for data exchange
• Standard communication protocol ModBus RTU
• Dynamic applicability by means of firmware upgrades
• Many configuration possibilities
• SD card interface for firmware upgrades and data-storage
• DIN-rail mountable
PCS0100en
02.2008
Persy Control Services B.V.
Netherlands

Functions
With the P-bus gateway the P-bus can be controlled and / or monitored by means
of an universal data protocol. In this case the gateway also serves as a buffer for
data traffic. All information send and received over P-bus is being stored in an
internal buffer of the gateway. The same buffer can read and written to via RS-232,
RS-485 or Ethernet.
P-busses
The P-bus is a 3-wire bus connection consisting of a PC-, PU- and PD-line. The
system is composed of Siemens PTX rails and PTM I/O-modules. A detailed
description can be found on the Siemens website under doc.no. N8022.
One P-bus always consists of one master and one or more slaves. The gateway
possesses 2 connections for P-bus which can be configured and controlled
separately. There are 2 possible operating modes per P-bus connection:
• Master Mode
• Slave Mode
In Master Mode the gateway will provide the P-bus of 24VDC power on the PU-line
for the internal electronics in the slaves (I/O-modules). At the same time the bus
will be polled on presence of slaves and data transfer from and to these slaves will
be maintained by the gateway.
In Slave Mode the gateway acts as a slave on the P-bus which is already being
controlled by a master. For example this could be a Siemens DDC controller.
The 24VDC on the PU-line already provided by the master is now being utilized by
the gateway as a reference voltage for data transfer from and to the master. The
gateway will present itself to the master as it were a slave (I/O-module).
Communication
Configuration
Flexibility
Data communication between the gateway and other equipment is provided by the
international standardized data exchange protocol ModBus RTU. This could be
peer-to-peer in the case of RS-232 or RS-485 as well as in a (ether-)network over
TCP/IP.
Depending on the firmware being present in the gateway other data exchange
protocols are also possible.
The gateway can be configured with the use of a standard HTML web browser via
TCP/IP. Specialized computer software isn’t necessary. The configuration data is
stored in a non-volatile memory of the gateway and is persistent in case of power
failure or restart.
The firmware in the gateway can be upgraded by means of a SD card. New
firmware releases and applications will be made available for download on our
website: www.persy.nl. The firmware can be stored on a SD card with a standard
PC equipped with a SD card reader/writer or ordered directly and loaded into the
gateway on-site. Therefore the P-bus Gateway stays an all-round, scalable and
dynamic product with a great variety in fields of application.
If desired, project specific firmware can be acquired to be able to adapt to your
customers needs.
2/12
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
PCS0100en
02.2008

LED presentation
LED Color Activity Meaning / problem solving
Device 24VAC Green Permanently off
No power available
check power supply
Permanently on Power available
STATUS Red Permanently off Device functions properly
Permanently on Hardware reset
Blinking
Hardware ready for firmware upgrade
Fast Blinking
Firmware upgrade in progress
!! Do not switch off the device !!
Slow Blinking
Hardware failure
In case of repeating failure after several
attempts to restart, the gateway needs to
be replaced
P-BUS 1 / P-BUS 2 MASTER Green Permanently off
P-bus functions in slave mode
Reference voltage on PU-line is being
utilized from the bus master
Permanently on
P-bus functions in master mode
Reference voltage on PU-line is being
provided by the P-bus Gateway.
ACTIVITY Yellow Blinking Data transfer on the P-bus
OVERLOAD Red Permanently off P-bus functions properly
Permanently on
Load units overflow on the P-bus
Remove one or more slaves from the P-
bus
Blinking
Short-circuit on the P-bus
Check P-bus wiring
RS-485 RxD Yellow Blinking Receives data
TxD Yellow Blinking Transmits data
RS-232 RxD Yellow Blinking Receives data
TxD Yellow Blinking Transmits data
ETHERNET LINK Green Permanently off No connection
Permanently on Connection ready
ACTIVITY Yellow Blinking Receives / transmits data packets
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
3/12
PCS0100en
02.2008

Disposal
This device contains electric and electronic components and must not be disposed
of with domestic waste. Printed circuit board and housing must be disposed of
separately.
The local and actual regulations must be observed.
Technical data
General device data
Operational data
Interface P-bus (2x)
Interface RS-485
Interface RS-232
Interface Ethernet
Operating voltage AC 24 V ± 10 %
Safety extra-low voltage SELV
Protective extra-low voltage PELV HD 384
Frequency
50/60 Hz
Current consumption
Max. 2 A
Power consumption
Data backup in case of power failure
Configuration data (EEPROM)
Polling cycle at I/O-modules
Transmission speed
Signal level
Max. 45 VA
> 10 years
0,25 s
62,5 KBaud
Load units (1 l.u. = 12,5mA) Max. 64
Maximum baud rate
Protocol
Galvanic isolation
Maximum baud rate
Protocol
Flow control
Interface type
Bit rate
Connector
DC +23 V and 0 / –5 V
115,2 KBaud
Firmware dependent
Yes
115,2 KBaud
Firmware dependent
RTS/CTS (configurable)
10BASE-T, IEEE 802.3 compatible
10 MB/s
RJ-45
Interface SD card Slot type Standard SD card
Dimensions
24 x 32 x 2.1mm
Plug-in screw terminals Power supply and signals Stranded or solid conductors,
0,25 ... 2,5 mm² or 2 x 1,5 mm²
Single cable lengths
RS-485
P-bus
Cable length, special requirements
Cross-section
RS-485
RS-232
Cable type
Ethernet
Cable type
Twisted-pair, stranded or solid
conductors,
2 x 1,0 mm² or Standard CAT5 UTP
or STP
Max. 50m
Max. 200m
Min. 3 x 0.75 mm²
Max. 30 m
Max. 3 m
9-core standard screened cable
Max. 100 m
Standard CAT5 UTP
4/12
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
PCS0100en
02.2008

Housing protection
standard
Protection standard to EN 60529
Ambient conditions Operation Class 3K5 to IEC 721
Temperature 0 ... 50 °C
Humidity
< 85 % rh
Industry standards
Dimensions
IP30
Transport Class 2K3 to IEC 721
Temperature – 25 ... 65 °C
Humidity
< 95 % rh
Product safety
Automatic electronic controls for
household and similar use EN 60730-1
Electromagnetic compatibility
For use in residential, commercial
and light industrial premises
Interference immunity EN 50082-1
Emitted interference EN 50081-1
Meets the requirements for CE marking:
Electromagnetic compatibility
Low Voltage Directive
See “Dimensions”
89/336/EEG
73/23/EEG
Weight Including packaging Approx. 600 g
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
5/12
PCS0100en
02.2008

Connection terminals
Pin layout
Pin Code Description
X1 Power supply
1 G AC 24V Phase
2 G0 AC 24V Neutral
X2 P-bus 1
X3 P-bus 2
X4 RS-485
1 PC Synchronization line (clock)
2 PU Reference voltage
3 PD Data line
1 PC Synchronization line (clock)
2 PU Reference voltage
3 PD Data line
1 A Data A
2 B Data B
3 C Shielding (common)
Notes • The wires of the same twisted pair must be connected
to the A and B terminals
• Screening is not usually necessary
X5 RS-232
X6 Ethernet
1 NC Not Connected
2 TxD Transmit Data
3 RxD Receive Data
4 NC Not Connected
5 SGND Signal Ground
6 NC Not Connected
7 CTS Clear To Send
8 RTS Request To Send
9 NC Not Connected
1 TD+ Transmit Data +
2 TD- Transmit Data -
3 RD+ Receive Data +
4 NC Not Connected
5 NC Not Connected
6 RD- Receive Data -
7 NC Not Connected
8 NC Not Connected
6/12
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
PCS0100en
02.2008

Dimensions
all dimensions in mm
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
7/12
PCS0100en
02.2008

Connection diagrams
P-bus control with universal DDC-Controller
In this configuration it is possible to control the P-bus (I/O-modules) with an universal
DDC-controller. The electrical connection between the gateway and the DDCcontroller
can be established over RS-232, RS-485 or Ethernet. The gateway acts in
this case as a transparent connection between the DDC-controller and the P-bus I/O
modules.
8/12
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
PCS0100en
02.2008

Data exchange between DDC-controllers over P-bus (with gateway)
In this configuration data exchange is possible between two DDC-systems of different
brand over P-bus. The gateway acts in this case as a transparent connection between
the two DDC-controllers. Each controller manages its own P-bus I/O modules and
therefore its own processes. In complementary to this, the gateway creates
(configurable) “virtual” I/O-modules in order to virtually connect the two DDCcontrollers.
The virtual I/O-modules behave as if they were tied to each other on
hardware level (see next connection diagram without gateway).
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
9/12
PCS0100en
02.2008

Data exchange between DDC-controllers over P-bus (without gateway)
10/12
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
PCS0100en
02.2008

Remote I/O over Ethernet TCP / IP
In this configuration it is possible to control a process remotely over Ethernet. The
DDC controller is being placed in control cabinet 1a for example and controls a
process locally over P-bus. The combination of 2 gateways connected via TCP / IP
extends this P-bus to control cabinet 1b from where another process is being
controlled.
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
11/12
PCS0100en
02.2008

I/O monitoring
In this configuration it is possible to monitor processes over P-bus. All signals from and
to the DDC-controller are being monitored by the gateway and can be readout /
visualized with a remote protocol.
© 2008 Persy Control Services B.V.
www.persy.nl
Subject to changes
12/12
Persy Control Services B.V.
Netherlands
PBGW2.128 – P-bus Gateway
PCS0100en
02.2008