Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 73)

Advanced Instruction Set
Chapter 6
6Ć16
A maximum of eight subroutines can be programmed in the subroutine area.
Each subroutine begins with a label instruction and (when you want to exit to
your main program) ends with a return instruction. We will discuss jump, label,
and return instructions later in this section.
Subroutine Area Instruction
Symbol: SBR
Purpose: Serves as an end of program statement for the main program
(Figure 6.8).
Figure 6.8
Advance Data Instruction Format (General)
112
00
JSR
01
Rung 1
RET
Rung 7
114
06
U
012
11
Rung 3
112
02 10
013
Rung 2
116
11
U
200
17
Rung 4
116
02
116
13
Subroutine Area
LBL
01 114
06
012
11
Rung 5
116
11
116
12
116
13
EN
200
17
DN
200
15
Rung 6
Block
Format
Instruction
NOTE: The block format instruction can be any file, sequencer, or block transfer instruction.