Filter
Top Products
4-152 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
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 address
character 3 character 4 address + 1
character 5 character 6 address + 2
character 7 00 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 |
| |_____|
|