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Network In Control Command
The Network In Control command is used to allow the network to enable or disable
itself from controlling the system. When set to zero, the contents of the remainder of
the Control Message, the Suction Pressure Setpoint Message, and the Process
Temperature Set-point Message will be ignored. When read, the current value of the
Network In Control register will be returned.
Compressor Start/Stop Command
The Compressor Start/Stop command is used to start and stop the compressor or to
put the compressor Online, depending on the current mode. When set to 0, nothing
will occur. When set to 1, the compressor will stop (if running) but remain Online. A
value of 2 will start the compressor as long as the mode is Remote or Auto-Remote and
the compressor is Online. A value of 3 will stop the compressor with a failure indication
and take it Offline. This command is intended to be used by the master for system
safeties (High Level Shutdown, NH3 detection, etc.). A value of 4 will put the
compressor Online. The Start and Online commands are also used in conjunction with
the Auto Start/Stop Control to allow the compressor to Cut-In and Cut-Out by itself.
NOTE: After a failure or if an operator at the local panel hits the Stop pushbutton, the
compressor must be placed back online by the operator at the machine or through the Online
command. It is the responsibility of the system programmer to ensure that restarts after failures
are only allowed after the operator verifies the safety and integrity of the system. Also, the
Online command may result in the compressor starting immediately, depending on the value of
the control parameter.
The following table summarizes the actions taken for each mode.
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