Applies To:
  • CitectSCADA x.x
Summary:
The SIDIRECT Citect device driver is a serial driver using the AS511 protocol to talk directly to the Siemens S5 series CPUs. I have used the driver with the smaller CPUs and it worked, but when I used it with the higher performance CPUs, it didn't. Why? 

Solution:
The AS511 protocol varies from CPU to CPU. Most CPUs are handled by the SIDIRECT driver with no problems. The following lists the CPU models which are not supported:
  • CPU945 - Used with the S5-115
  • CPU928 - Used with the S5-135/155
  • CPU946 - Used with the S5-135/155
  • CPU947 - Used with the S5-135/155
  • CPU948 - Used with the S5-135/155

This driver is currently under modification to allow direct communications to the CPUs mentioned here. The knowledge base article will be amended when these modifications are made.

 
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