Hello Experts,

I am using S71515-2PN PLC (V1.8) and I need to establish communication with DCS over MODBUS TCP/IP. PLC is server so I have used MB_Server function for this. The status is always 7002. I checked the help and it says "CONNECTION IS BEING ESTABLISHED" but status never changes to 7000. The BUSY bit is always on. Anybody knows what could be the reason.

Thanks.

Hi Duris,

Thanks for the reply.

Actually I performed this test earlier with MODBUS Client utility like MODBUS Poll, MODBUS Master Simulator from Radzio etc. but I have similar issue. The status is always 7002. I am not able to look inside the FB because this is locked function from Siemens. I am complete stuck with this. I could not understand that what is the issue.

I have another system with same configuration and that system is working correctly. BTW can you please explain the meaning of "Intermediate Call, Connection is being established" (Status 7002).

Hi,

I will check once again your recommendations. Here is the attached file for holding register. BTW, should I use 72 or 64 as HW Identifier. Currently I am using 72, which is for port X2 P1 (CPU 1515-2PN).

I am using FBD as language and as you will see the ENO is active. If the instruction will not be active then I will not get the status as 7002. Hope, I am not missing something.

Hi mopS04,

I am using MODBUS Poll as a client. So I have defined the IP address of my notebook into TCON_IP_V4 and PLC as Server address into MODBUS Poll. But MODBUS Poll says, "Write Error".

I am not sure where I am making a silly mistake.

Hello sir,

Did you solve your problem ? Because I have exactly same things !

Thanks

Hi Autom,

do you have the same devices etc. as the topic creator? did you try the suggestions from the expert Duris? If yes, what results did you receive?

Please provide as much information as you can, so that we can help you better.

BR,

Noodles