S7-417-5H communication jobs

Hello guys and ladies.

I have a couple of CPU417-5H + 2 workstations with fault-tolerant connection to PLCs. I'd like to understand what is communication jobs? I know that the value of communication jobs depends on the value of each send/receive or similar type blocks such as alarms. How many tags can I use and as it influence on communication jobs? If the number of tags doesn't depend on the number of communication job, how many OCM (s7_m_c) can I use in the project? What if I add too many tags into the project?  My software is PCS 7 v 9.0

dchartier

Hello neurobot;

I am not sure that I can answer your questions completely, except to say that communication jobs are determined (or rather limited) by the CPU's individual technical specs. Details can be found in the respective Communications chapter of the S7-400 CPUs manual and the S7-400H CPUs manual:

SIMATIC S7-400 S7-400 Automation System, CPU Specifications

https://support.industry.siemens.com/cs/us/en/view/53385241

SIMATIC Fault-tolerant systems S7-400H (V6.0)

https://support.industry.siemens.com/cs/us/en/view/82478488

Hope this helps,

Daniel Chartier

 Thank you for your answer but I know the limit of communication jobs of my PLC. What I want to find out what communication jobs are. Moreover, I don't know how the jobs are connected with WinCC tags and OCM attributes or they are independent.  Anyone else would explain this question?

Hi neur0b0t,

Only relevant for special S7-400 CPU-

2. The volume of data to be communicated depends upon which comm. block u use. e.g. GET/PUT has lower capacity than AG_SEND/AG_RCV on the same network.

3.  The no. of s7_m_c tags u want to generate depends upon SCADA license. There is no popup in Step-7 but SCADA will give popup upon exceeding tags count.