Automationdirect.com Stellar SR44, User Manual

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6–31
6.7.3 – Productivity3000 PLC Example Program (continued)
StartUnitCommand
4
4.1
StopUnitCommand
Enable
3
This rung is always active and Auto-Polls the SoftStarter for Status. The tag “StarterStatusWord16” is converted into Bool tags via the Unpack Bit
instruction (located in task “StatusBits”), so we will have a tag dedicated to various status conditions (Stopped, Starting, Current Limit, Alarm, etc.).
These Bool tags could be used in ladder to verify operation or to set indicator lights, for example.
MODBUS READ
StarterStatusWord16
CPU-485
Slave Node Number 1
Automatic Polling 300 0
Don’t Skip Execution
Word Swap
No Mapping
Slave Modbus Starting Address 8
Modbus Decimal Addressing
Modbus Function Code 3: Read Holding Registers
Tag Name Mapping
Non-Array
Tag
In Progress ReadStarterInProg
Complete ReadStarterCmplt
Success ReadStarterSuccess
Error ReadStarterErr
Timeout ReadStarterO
Exception
Response String ReadStarterException
Enable
MODBUS WRITE
In Progress WriteStarterInProg
Complete WriteStarterComp
Success WriteStarterSuccess
Error WriteStarterError
Timeout WriteStarterTO
Exception
Response String WriteStarterException
Serial Port CPU-485
Slave Node Number 1
Automatic Polling 300 20
Don't Skip Execution
No Word Swap
Map 32 bit data to 16 bit
Slave Modbus Starting Address 125
Modbus Decimal Addressing
Modbus Function Code 6: Write Single Register
Tag Name Mapping
Non-Array
Tag
P124 Starter Control
StartUnitCommand
RST
TopOfRamp
SET
StartUnit
StartUnitCommand
5
5.1
6
Enable
COPY DATA
Source
7
Destination
P124 Starter Control
This rung, controlled by “StarterUnit” input (usually a pushbutton input to the P3) activates the “Start Unit” sequence by setting the Bool
“StartUnitCommand”. Then a value of 7 (“Bus Start”) is written to tag “P124 Starter Control”. This will begin writing the tag value to the
SoftStart until the status bits being read from the SoftStart show the unit is acting on the command. Then the sequence resets.
“TopOfRamp” and “Starting” are Bool tags used to display the status of the unit. When either of these tags turns on, the sequence will reset.
6.1
Starting
6.2
StopUnitCommand
StopUnitCommand
RST
Stopping
SET
StopUnit
StartUnitCommand
7
7.1
8
Enable
COPY DATA
Source
8
Destination
P124 Starter Control
This rung, controlled by “StopUnit” input (usually a pushbutton input to the P3) activates the “Stop Unit” sequence by
setting the Bool tag “StopUnitCommand”. Then a value of 8 (“Bus Stop”) is written to tag “P124 Starter Control”.
Again, writing will begin until status bits reflect the desired response. Then the sequence resets.
Chapter 6: Serial Communications
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019