12/27/2009 2:33 PM | |
Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (308) |
Hello, If you have seen correct messages passing over the line, it is hard to believ that the "Done" bit never comes up. Be aware that this bit comes up only for one cycle, and if you just online to its status, you will hardly be able to see it coming up. The successfull copletion of a modbus commandis communicated to the SIMATIC user program by means of an edge at output DONE of the P_SND_RK. The same applies to the NDR bit. The user is informed of data reception in the CPU by means of an edge at output NDR. And this is also the case for errors. |
Best regards |
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