Applies To:
  • CitectSCADA 5.xx, 6.xx
  • CitectHMI 5.xx, 6.xx
Summary:
I have successfully setup communication to a Shinko device ACS-13A-R/M-C5 (9600) through modbus and can read and write each register one at a time.
However once CitectSCADA reads block, it gives # com and does not return any error in the Kernel.  

Solution:
The Shinko device hardware only supports single register reads and writes.
The solution is to prevent multiple physical requests by setting the driver's MaxPending parameter to 1 in the Citect.ini file:

[Modbus]
Maxpending=1

 
Keywords:
Shinko, modbus  

Attachments