GE 90-30/20/Micro manual Svcreq #18 Read I/O Override Status

4

SVCREQ #18: Read I/O Override Status

Use SVCREQ function #18 in order to read the current status of overrides in the CPU.

Note

This feature is available only for 331 or higher CPUs.

For this function, the parameter block has a length of 1 word. It is an output parameter block only.

0 = No overrides are set.

1 = Overrides are set.

address

Note

SVCREQ #18 reports only overrides of %I and %Q references.

Example:

In the following example, the status of I/O overrides is always read into location %R1003. If any overrides are present, output %T0001 is set on.

		_____	_____
%I0001
——/———		SVC_—————————— EQ_		–
		REQ	INT
					%T0001
CONST —FNC			CONST —I1	Q——————————————————————————————————————————( )—
00018			00001
%R1003 —PARM			%R1003 —I2
	_____		_____

GFK-0467K Chapter 4 Series 90-30/20/Micro Instructions Set 4-161