Man Al2000_eng.pdf - FF-Automation

AL 2000 User Guide
Page 4 - 3
06/05/00
4.1.2 Addresses of Inputs and Outputs
All I/O points have addresses, these are used by MODBUS. The address assignment can
be seen on the ALPro configuration screen's I/O map. I/O addresses are assigned in
blocks of 16, therefore there will be unused addresses if an I/O module requires less then
16 addresses. For an AIO74 module the used/unused addresses are:
AIO74 Inputs 0 1 2 3 4 5 6 - 8 9 10 11 12 13 14 -
AIO74 Outputs 0 1 2 3 - - - - - - - - - - - -
Unused addresses are represented by the '-' symbol
4.1.3 Serial Port Configuration
The AL2000 has 3 serial interfaces of which all can be configured to function as MODBUS
Slave and MODBUS Master (independently of one another). These are:
SER 1, SER 2
SER 3
RS-232
RS-485
The serial ports must be configured for the required baud rate and MODBUS master/
slave mode. This is done by initialising the following register outputs:
MODBUS modes SER 1, SER 2, SER 3 MODBUS Slave/MODBUS Master
Baud Rates SER 1, SER 2, SER 3 0,3/1,2/2,4/4,8/9,6/19,2 kbit/s
28,8/38,4/57,6/115,2 kbit/s
Maximum cable length for RS-232 is 15m for 9600 bit/s
Maximum cable length for RS-485 is 1200m for 9600 bit/s
4.2 Setting Up A MODBUS Master
A MODBUS master can be set up on SER1 and/or SER2 and/or SER3 by following the
steps below.
Example: Set The Serial Port 2 to Modbus MASTER, baud rate 9600,N,8,1
STR R C 5
EQ R O 215 ; set SER2 to MASTER mode
STR R C 4
EQ R O 229 ; set SER2 baud rate to 9600
STR R C 0
EQ R O 219 ; set SER 2 data configuration to 8,N,1
See chapter 9.3 Register Output Configuration for available baud rates, communication
modes and data configuration modes.
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