GE PACSystems RX7i

Chapter 6. Service Request Function
308 PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual GFK-2950C
6.19 SVC_REQ 18: Read I/O Forced Status
Use SVC_REQ 18 to read the current status of forced values in the CPU's %I and %Q memory areas.
Note: SVC_REQ 18 does not detect overrides in %G or %M memory types. Use %S0011 (#OVR_PRE)
to detect overrides in %I, %Q, %G, %M, and symbolic memory types.
The parameter block has a length of one word used for output only.
Output
Address
0 = No forced values are set
1 = Forced values are set
SVC_REQ 18 Example
SVC_REQ reads the status of I/O forced values into
location %R1003. If the returned value in %R1003
is 1, there is a forced value, and EQ INT turns the
%T0001 coil ON.