User`s manual

22
SIEMENS (S5 COMMUNICATIONS) REFERENCE
The following indicates PLC-oriented problems displayed on the SOI
and possible actions to take if necessary.
S5 PROTOCOL
Establishing COMM
Attempting to communicate to PLC
This is the normal display when initiating communications with the
PLC.
S5 PROTOCOL
<PLC NOT FOUND>
This is displayed after a 4-second interval of attempting to establish
communications with the PLC.
Check cabling and communications parameters to verify that the PLC
matches those of the SOI. Perform the Self-Test function if the Comm
port is suspected.
Comm ERROR
Press ENTER To Reset
This is displayed after a 4-second interval of attempting to establish
communications with the PLC.
Check SOI to PLC cabling and PLC operating conditions.
COMM LOSS, PRESS Y
ERROR CODE: XXX
Communication with the PLC was lost after 16 attempts.
Refer to Communication Error Codes, below, for more information.
Communication Error Codes
Communication Error Codes appear on the SOI display as follows:
COMM LOSS, PRESS Y
ERROR CODE: XXX
where XXX is a PLC-specific error code.
The Communication Error codes may seem cryptic. They do, however,
offer valuable information when other symptoms either have not been
discovered or have not been understood.
The most common Communication Error Codes specific to the com-
munication protocols for S5 and the SOI are described below.