GE PACSystems RX7i - SVC_REQ 3: Change Controller Communications Window Mode; To Disable the Controller Communications Window; To Re-Enable or Change the Controller Communications Window Mode

Chapter 6. Service Request Function
GFK-2950C February 2018 281
6.4 SVC_REQ 3: Change Controller Communications Window
Mode
Use SVC_REQ 3 to change the controller communications window mode and timer value. The change
takes place during the next CPU sweep after the function is called.
The parameter block has a length of one word.
SVC_REQ 3 executes unless a mode other than 0 (Limited) or 2 (Run to Completion) is selected.
6.4.1 To disable the controller communications window:
Enter SVC_REQ 3 with this parameter block:
Address
High Byte
Low Byte
Address
0
0
6.4.2 To re-enable or change the controller communications window
mode:
Enter SVC_REQ 3 with this parameter block:
Address
High Byte
Low Byte
Address
Mode: 0 = Limited
2 = Run to Completion
1ms  value  255ms in 1ms increments
SVC_REQ 3 Example
When enabling input %I00125 transitions
on, the controller communications window
is enabled and assigned a value of 25ms.
When the contact transitions off, the
window is disabled. The parameter block is
in global memory location %P00051.