Svcreq 4: Change System Communications Window Mode; Changing The System Communications Window Mode - GE VersaMax PLC User Manual

11.6 SVCREQ 4: Change System Communications
Window Mode
202 GFK-1503E
For public disclosure
Use SVCREQ 4 to change the system communications window mode (Limited or
Run-to-Completion). The change occurs during the next CPU sweep after the function is
called. The time of the window cannot be changed; it is always 6ms.
SVCREQ 4 passes power flow to the right unless a mode other than 0 (Limited) or 2
(Run-to-Completion) is selected.
The parameter block has a length of one word.
11.6.1 Changing the System Communications
Window Mode
To change the programmer window, enter SVCREQ 4 with this parameter block:
High Byte
address
11.6.1.1 Example of SVCREQ 4
In the following example, when enabling input %I0003 is ON the system communications
window is changed to Run-to-Completion mode. The parameter block is at location %
R0025.
_
Low Byte
Mode
SVC_
REQ
6
VersaMax PLC User Manual