Standard Screw Compressor - RWB Series
C-22
M&M
R
EFRIGERATION
I
NC
.
Control Message Description
The Control Message is a read/write message containing fields to start and stop the compres-
sor, change the compressor mode, and change the control setpoint group number.
The contents of the Control Message are shown in the following table and described further in
the paragraphs below.
NOTE: The data described by each register may be slightly different depending on if the register is
being read or written.
DF1
Word
Address
Modbus
Word
Address
Hex
Byte
Offset
Command
Description
Command
Format
N11:0 40101 0000 Network In Control
0 = Ignore cntrl and setpt msgs
1 = Network in control
1 40102 0002 Compressor Start/Stop
0 = No Change
1 = Stop Compressor
2 = Start Compressor
3 = Shutdown Compressor
4 = Compressor Online
2 40103 0004 Change Compressor Mode
0=Automatic
1=Manual
2=Remote
3=Auto-Remote
4=Sequenced
5=Unused
6=Local
3 40104 0006 Change Compressor Capacity
0 = Stop Loading Or Unloading.
1 = Load Command.
2 = Unload Command.
4 40105 0008 Acknowledge/Clear Active Alarms Non-zero = acknowledge/clear
5 40106 000A Change Current Setpoint Group 0-3 = Setpoint Group Number
6 40107 000C Change Control Type
0 = Suction Pressure Control
1 = Process Temperature Control
7 40108 000E Set Economizer Mode (Option)
0=Manual-Off
1=Manual-On
2=Auto
3=Sequenced
8 40109 0010 Auto Start/Stop Control
0 = Auto Start/Stop disabled
1 = Auto Start/Stop enabled
9 40110 0012 Spare
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