GE 90-30/20/Micro The example parameter blocks are located at address %R0150. They have the following content:

4-144 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
4
Example:
In the following example, when enabling contact FST_SCN is set, the parameter blocks for the
checksum task function are built. Later in the program when input %I0137 turns on, the number of
words being checksummed is read from the PLC operating system. This number is increased by 16,
with the results of the ADD_INT function being placed in the “hold new count for set” parameter.
The second service request block requests the PLC to set the new word count.
| _____ _____
| FST_SCN | | | |
|———| |———| XOR_|—————————————————|MOVE_|
| | | | |
| | WORD| | INT |
| | | | |
| %R0150 —|I1 Q|— %R0150 CONST —|IN Q|— %R0152
| | | +00001 | LEN |
| | | |00001|
| %R0150 —|I2 | |_____|
| |_____|
|
.
.
| _____ _____ _____
| %I0137 | | | | | |
|———| |——————| SVC_|—————————| ADD_|—————————————————| SVC_|—
| | | | | | |
| | REQ | | INT | | REQ |
| | | | | | |
| CONST —|FNC | %R0151 —|I1 Q|— %R0153 CONST —|FNC |
| 00006 | | | | 00006 | |
| | | | | | |
| %R0150 —|PARM | CONST —|I2 | %R0152 —|PARM |
| |_____| +00016 |_____| |_____|
|
The example parameter blocks are located at address %R0150. They have the following content:
0 = read current count %R0150
hold current count %R0151
1 = set current count %R0152
hold new count for set %R0153