6/2/2019 5:18 PM | |
Joined: 9/27/2006 Last visit: 9/10/2024 Posts: 12282 Rating:
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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 |
6/2/2019 6:59 PM | |
Joined: 4/8/2015 Last visit: 8/20/2024 Posts: 29 Rating:
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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? |
6/3/2019 7:04 AM | |
Joined: 12/9/2010 Last visit: 10/8/2022 Posts: 623 Rating:
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Hi neur0b0t, 1. Communication jobs- Only relevant for special S7-400 CPU- Here you enter the maximum number of communication jobs via all the configured S7 connections. Each communication job (for example, STATUS, USEND/URCV, BSEND/BRCV, PUT/GET/PRINT, START/STOP/RESUME, STATUS, USTATUS, ALARM, ALARM_8, ALARM_8P, NOTIFY, AR_SEND) is assigned an instance data block, which occupies memory. The number of instance data blocks is identical to the number of communication jobs. 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. |
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