User`s manual

CHAPTER 3: TROUBLESHOOTING

This chapter of the Siemens (S5 Communications) Reference provides

solutions to possible operational problems with the SOI and its use with

the Siemens S5 processor.

Also contained is a description of the Communication Error Codes

specific to the S5 communication protocol used for the S5 processor

and the SOI.

General Symptoms and Solutions

Typically, any problems that may be specific to a particular PLC will

involve communications between the SOI and the PLC. The communi-

cation driver software used in communicating with the PLC has been

tested and has passed critical compliance procedures, thereby limiting

the software as a possible problem. The only other possible problems are

the cabling configurations and the communication parameters (baud

rate, data bits, and parity) involved. These parameters must be identical

for both the SOI and the PLC. The cabling and the communications

parameters are always the first things to check.

If the communications cabling and communications parameters are all

correct, perform the Self-Test Mode to rule out any non-functioning

features of the SOI.

Note: Refer to the SOI-120 and SOI-260 User’s Manual for information

about the Self-Test Mode.