Dear Sir,

2 days ago, CP 341 slave RTU S7 300 communicate with Master Honeywell normally. Can read/write coil, register.

But now can't write single coil or multi coil. So temporary I disable function code write single coil on Honeywell, The link is ok but can't write just only read.

Assign parameter CP 341:

Id slave: 223

Baudrate 9600, 8, 1, N

Honeywell only write 8 bit to Siemens S7 300

I already check limit in assign memory CP 341 is ok. (because I never change)

Please help me to solve this problem.

Thanks and best regard,

It has error like above. Please advise.

error code in buffer CP is 0E 38

Maybe CP parameter:

First I upload program from S7-300 (running). Then I modify only logic by create new one network just a "contact" and one "out put".

After that I download. and modbus link to Honeywell is fail (only Honeywell alarm fail) even though the led tx, rx on CP 341 still blinking normal.

I must disable function code write coil on Honeywell DCS and no more alarm link fail on DCS but can't write to S7 300 through mod bus.

Please help me in this case. Note: 2 years ago the other package also have the same problem like this. (2 package are the same).

Error code as attachment:

02

301

Please advise me