ABB AC500 PLC - 1.7.2.3.6 Addressing; 1.7.2.3.7 DC551-CS31 Limitations; Digital I;O; Analog I;O

without the Fast Counter with the Fast Counter (only
with AC500)
Counter input data (words) 0 5 (16 DI + 4 AI)
Counter output data (words) 0 9 (16 DO + 8 AO)
1.7.2.3.6 Addressing
An address must be set at every module so that the field bus communication module can
access the specific inputs and outputs.
The address (00 to 99) is set with two rotary switches on the front panel of the module.
CS31 Bus Module reads the position of the address switches only during the initialization after
power ON, i.e. changes of the setting during operation remain ineffective.
1.7.2.3.7 DC551-CS31 Limitations
Digital I/O
DC551-CS31 is able to manage up to 240 digital I/O channels. It uses 2 digital bus addresses in
this case.
The physical address to identify the I/O is address n (switch address) for the 1st module
(120 I/O)
address n + 7 + bit 8/15 = 1 for the 2nd
module
To be compatible with old CPU and EC500 using this physical address, to address I/O in user
program: Use only 6 I/O modules with 32 DI.
Analog I/O
Analog limitation to 40 AI/AO with 4 bus addresses used.
Case of DC551-CS31 with Fast Counter
An additional bus address is used for "double word" values of the Fast Counter.
The maximum configuration is shown in the following table.
DC551-
CS31
8DI + 16
DC
+ counter
16 AI 16 AI DC532 DC532 DC532 DC532 DC532
The following configuration uses 7 bus addresses (the Fast Counter needs 16 DI + 16 DO + 4
AI + 8 AO):
2 bus addresses for digital I/O (24 + 16 + 5x32)DI + (16 + 16 + 5x16)DO = 200 DI (>120) + 112
DO
5 bus addresses for analog I/O (4 + 2x16)AI + 8 AO = 36 AI + 8 AO
Device Specifications
Communication Interface Modules (S500) > CS31
2019/04/173ADR010121, 13, en_US816