Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 217)

12 Chapter
12–1
Using Program Flow Control Instructions
This chapter contains general information about the program flow
instructions and explains how they function in your application program.
Each of the instructions includes information on:
•
what the instruction symbol looks like
•
typical execution time for the instruction
•
how to use the instruction
•
how to enter the instruction
In addition, the last section contains an application example for a paper
drilling machine that shows the program flow control instructions in use.
Program Flow Control Instructions
HHP
Display
Mnemonic
Function
Code
Name Purpose Page
LBL
JMP
LD LBL
130
131
Jump to Label
Label
Jump forward or backward to the specified label instruction. 12–2
SBR
JSR
LD SBR
RET
132
133
134
Jump to Subroutine
Subroutine
Return from Subroutine
Jump to a designated subroutine and return. 12–3
MCR 135 Master Control Reset Turn off all non-retentive outputs in a section of ladder program. 12–6
TND 136 Temporary End Mark a temporary end that halts program execution. 12–7
SUS 137 Suspend
Identifies specific conditions for program debugging and system
troubleshooting.
12–7
IIM 138
Immediate Input with
Mask
Program an Immediate Input with Mask. 12–8
IOM 139
Immediate Output with
Mask
Program an Immediate Output with Mask. 12–9
Use these instructions to control the sequence in which your program is
executed.
Since these are output instructions (except LD LBL and LD SBR), they do
not have LD, AND, and OR equivalents.
About the Program Flow
Control Instructions