Svcreq 11: Read Plc Id; 1Output Parameter Block Format For Svcreq 11; 2Example Of Svcreq 11 - GE VersaMax PLC User Manual

11.12 SVCREQ 11: Read PLC ID

The Service Request Function
For public disclosure
Use SVCREQ 11 to read the name of the PLC executing the program.
11.12.1 Output Parameter Block Format for SVCREQ
11
The output parameter block has a length of four words. It returns eight ASCII characters;
the last is a null character (00h). If the PLC ID has fewer than seven characters, null
characters are added to the end.
address
address + 1
address + 2
address + 3
11.12.2 Example of SVCREQ 11
In this example, when enabling input %I0302 goes OFF, register location %R0099 is
loaded with the value 11, which is the function code for the Read PLC ID function. The
program block READ_ID is then called to retrieve the ID. The parameter block is located
at address %R0100.
%I0303
MOVE
UINT
SVC_
REQ
Low Byte High Byte
character 1 character 2
character 3 character 4
character 5 character 6
character 7
READ_ID
0
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