Automationdirect.com Stellar SR44, User Manual

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6–21
6.7.1 – CLICK PLC Example Program (continued)
RST
Read Status
Interlock
b
C10
5
This rung controls the interlocking of the 2 previous comm instructions. Since the Receive
instruction is programmed to read continuously, this logic resets the interlock, UNLESS, the CLICK
program calls for the Start/Stop Send instruction to be activated.
Stop SoftStart
b
C23
Start SoftStart
b
C21
Read Status
Interlock
b
C10
_Always_ON
b
SC1
6
This rung takes the Status Word that was read from the Soft Start, and converts the word to control
bits. The bits, C100 thru C115, could be used in your program to turn on outputs, and/or they could
just be monitored by an Operator Interface to generate messages.
Copy
Src
Des
Unpack
Status Word from Strtr
h
DH1
Stopped
b
C100
4 20 ma
LevelReached
b
C115
7
When "Start PB" is pressed (activated), a value of "7" is copied to DS30, and C21 is set. This will
activate the Send instruction, which will write the contents of DS30 to P124. When the "Starting" or
"Top of Ramp" bits (read from the unit) turn on, the "Start" sequence is reset.
Copy
Src
Des
Single
i
7
i
DS30
Start PB
b
C20
SET
Start SoftStart
b
C21
RST
Start SoftStart
b
C21
8
Stop PB
b
C22
TopOfRamp
b
C103
Starting
b
C101
Chapter 6: Serial Communications
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019