Svc_Req 45: Skip Next I/O Scan - GE PACSystems RX7i Cpu Programmer's Reference Manual

6.29 SVC_REQ 45: Skip Next I/O Scan

Use the SVC_REQ function #45 to skip the next output and input scans. Any changes to the output
reference tables during the sweep in which the SVC_REQ #45 was executed will not be reflected on
the physical outputs of the corresponding modules. Any changes to the physical input data on the
modules will not be reflected in the corresponding input references during the sweep after the one in
which the SVC_REQ #45 was executed.
This function has no parameter block.
Note: This service request is provided for conversion of Series 90-30 applications. The Suspend I/O
(SUS_IO) function block, which is supported by all PACSystems firmware versions, should be
used in new applications.
Note: The DOIO Function Block is not affected by the use of SVC_REQ #45. It will still update the I/O
when used in the same logic program as the SVC_REQ #45.
SVC_REQ 45 Example
In the following LD example, when the
the next Output and Input Scan are skipped.
GFK-2950C
Idle
contact passes power flow,
February 2018
Chapter 6. Service Request Function
327