GE 90-30/20/Micro manual Svcreq #11 Read PLC ID

4

SVCREQ #11: Read PLC ID

Use SVCREQ function #11 to read the name of the Series 90 PLC executing the program.

Note

Of the CPUs discussed in this manual, Service Request 11 is supported only by 90-30 CPUs, beginning with Release 8.0.

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 appended to the end.

Low Byte	High Byte
character 1	character 2
character 3	character 4
character 5	character 6
character 7	00

address

address + 1

address + 2

address + 3

Example:

In the following example, when enabling input %I0001 transitions 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 actually retrieve the ID. The parameter block is located at address %R0100. Except for the enabling contact and function number, this is the same code used in the previous example.

%I0001%M0301 —— ——————————————————————————————————————————————————————————————(↓)—

	_____	__________
%M0301
—— ———MOVE_—————————— READ_ID			—
	WORD	__________
CONST —IN Q— %R0099
0011	LEN
	0001
	_____
.
Program Block READ_ID
	_____
%Q0102
—— ——— SVC_—
	REQ
%R0099—FNC
%R0100—PARM
	_____

4-152 Series 90-30/20/Micro Programmable Controllers Reference Manual–September 1998 GFK-0467K