Automationdirect.com Stellar SR44, User Manual

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Chapter 6: Serial Communications
6.7.3 – Productivity3000 PLC Example Program
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END
Enable
1
2
This rung breaks down the tag “StarterStatusWord16” retrieved from the Soft Start (Parameters 8 & 9). We use the “Unpack Bits” instruction,
which converts the 16-bit tag into 16 separate Boolean tags. These Bool tags can be monitored or used in the program for status, alerts, alarms, etc.
Task: StatusBits
CommCountDone
Cnt Up
Cnt Down
ReadStarterInProg
Always Off Bit
1
1.1
1.2
1.3
This rung monitors our Comm “InProgress” attempts to the SoftStarter. The 2 inputs are the Bool tags that are assigned in the MRX and MWX
instructions. It has a preset of 9999, and will reset itself. These 2 counters give us an easy way to monitor comms, to verify attempts and the
occurence of errors. If both counters are counting up in synch, then there are problems, which could be in addressing, wiring, or the slave itself.
WriteStarterInProg
Reset
Preset Value 9999
Don’t Reset
Current Value CommCountCurr
= Preset CommCountDone
COUNTER
CommErrorsDone
Cnt Up
Cnt Down
ReadStarterErr
Always Off Bit
2
2.1
2.2
2.3
This rung monitors our Comm Errors. Ordinarily, this counter will only be activiated very infrequently, unless a slave been lost.
It has a preset of 999, and will repeat itself.
WriteStarterError
Reset
Preset Value 999
Don’t Reset
Current Value CommErrCurr
= Preset CommErrorsDone
COUNTER
UNPACK BITS
Output Bit Number
Input StarterStatusWord16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Stopped
Starting
CurrentLimit
TopOfRamp
Dwell
FullConduction
EnergySaving
Stopping
Alarm
OverloadIntegrating
Stall
ForcedOverride
Noise
InhibitStart
DC IP reached
4-20maLevelReached
Task: Comms
This program is for illustrational purposes only, and is not intended for a true application.
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019
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