Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 59)

Relay-type Instructions
Chapter 6
6Ć7
Here two conditions are parallel. As long as one of the conditions (C1 or C2) is
true, a continuous path to the action exists. Therefore, the action is performed.
True
True
C3
C1 A
False
True
C4
C2
Here are two sets of parallel conditions. If either set of conditions are true, the
action is performed.
010
00
010
00
110
10
110
12
This illustration shows a program rung with branching, as it would appear by
the 1770-T3 terminal display. You create a branch by using two different
branch instructions. These are the branch start and branch end instructions.
Branch Start/End
Purpose: A Branch Start instruction begins each parallel logic branch of a rung.
It allows more than one combination of input conditions to energize an
output device.
A Branch End instruction completes a set of parallel branches.
Keystrokes: You enter a Branch Start or Branch End instruction by performing
the following steps
1. Press either [ ] or [ ].
Important: You must begin each rung of parallel conditions with a Branch
Start instruction.