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DMC-1400 Series Command Reference ZS
● 223
ZS
FUNCTION: Zero Subroutine Stack
DESCRIPTION:
The ZS command is only valid in an application program and is used to avoid returning from
an interrupt (either input or error). ZS alone returns the stack to its original condition.
ZS1 adjusts the stack to eliminate one return. This turns the jump to subroutine into a
jump. Do not use RI (Return from Interrupt) when using ZS. To re-enable interrupts, you
must use II command again.
ZS1 adjusts the stack to eliminate one return. This turns the jump to subroutine into a
jump. Do not use RI (Return from Interrupt) when using ZS. To re-enable interrupts, you
must use II command again.
ARGUMENTS: ZS n
where
0 returns stack to original condition
1 eliminates one return on stack
USAGE:
While Moving
Yes
Default Value
---
In a Program
Yes
Default Format
---
Command Line
No
Can be Interrogated
Yes
Used as an Operand
Yes
Controller Usage
ALL CONTROLLERS
OPERAND USAGE:
_ZSn contains the stack level for the specified thread where n = 0 or 1. The response, an
integer between zero and seven, indicates zero for beginning condition and seven for the
deepest value.
deepest value.
EXAMPLES:
II1
Input Interrupt on 1
#A;JP #A;EN
Main program
#ININT Input
Interrupt
MG "INTERRUPT"
Print message
S=_ZS Interrogate
stack
S= Print
stack
ZS Zero
stack
S=_ZS Interrogate
stack
S=
EN
EN