Rockwell Automation Current Input Module - Manual (Page 38)

4Ć20
4.5 Sample AutoMate Current Input
Application Program
The sample AutoMate current input application program in figure
4.13 is written for a Current Input module in a remote rack that is
controlled by an AutoMate 40 processor. If your system uses an
AutoMate 30 processor, the addresses you would use must be
changed accordingly. If the Current Input module is in a local rack,
LOCIN/LOCOUT commands would replace the REMIN/REMOUT
commands. Refer to the A30/A40 Software Reference Manual
(JĆ3150) for additional information.
In the sample AutoMate program, the Current Input module is
connected to three 4Ć20 mA transmitters which are wired into a
pressure polymerization process.
One transmitter is used to sense the level of the material in the
reactor. The second transmitter has its span calibrated for 0 to 3000
psig (gauge poundsĆperĆsquare inch) and is used during startup
operation. The third transmitter has its span calibrated for 1940 to
1960 psig and is used for process control.
Channel 0: Material Level
Process Parameters
Configuration Values
D Maximum = 20 feet Reg. 24 = 2000 (Scaled in
ąąą0.01 Ft)
D Minimum = - 1 feet Reg. 25 = -100
D High High Alarm = 18 feet Reg. 27 = 1800
D High Alarm = 16 feet Reg. 28 = 1600
D Low Alarm = 4 feet Reg. 29 = 400
D Low Low Alarm = 0 feet Reg. 30 = ăă0
Channel 1: Startup Pressure
Process Parameters
Configuration Values
D Maximum = 3000 psig Reg. 24 = 3000 (Scaled
ąąądirectly in psig)
D Minimum = 0 psig Reg. 25 = ăăă0
D High High Alarm = 2500 psig Reg. 27 = 2500
D High Alarm = 2000 psig
Reg. 28 = 2000
D Low Alarm = 500 psig Reg. 29 = ă500
D Low Low Alarm = 250 psig Reg. 30 = ă250
Channel 2: Operating Pressure
Process Parameters
Configuration Values
D Maximum = 1960 psig Reg. 24 = 10000 (Scaled in
ąąą0.01% of span)
D Minimum = 1940 psig Reg. 25 = ăăă0
D High High Alarm = 1958 psig Reg. 27 = 9000
D High Alarm = 1955 psig
Reg. 28 = 7500
D Low Alarm = 1945 psig Reg. 29 = 2500
D Low Low Alarm = 1942 psig Reg. 30 = 1000