Emerson Vilter PLC, Operation Manual

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12 – 26
Section 12 • Communications with a Central Controller/DCS
Blower Package PLC Operation Manual •Vilter/Emerson • 35391BLP
Blower Commands: “REAL_IN” (Data Type = REAL)
Interface Tag Description Units
REAL_IN[0] Remote Discharge Pressure Setpoint PSIA
REAL_IN[1]
REAL_IN[2]
Remote Suction Pressure Setpoint PSIA
REAL_IN[3] Common Discharge Header Pressure From DCS PSIA
REAL_IN[4] Common Suction Header Pressure From DCS PSIA
REAL_IN[5]
Blower 1 Remote Manual Speed % Speed
REAL_IN[6]
Blower 2 Remote Manual Speed % Speed
REAL_IN[7] Blower 3 Remote Manual Speed % Speed
REAL_IN[8] Blower 4 Remote Manual Speed % Speed
Table 12-9. Blower Command (Real)
DISCRETE BLOWER COMMANDS
Discrete Blower commands are presented in Double
Integer Format. To send discrete commands, it is neces-
sary to address the speci
fi c bits of the Double Integer.
If Control by communications is enabled from the
Write Data: “BOOL_IN” (Data Type = DINT)
Interface Tag Description
BOOL_IN[1].0
BOOL_IN[1].1 Blower 1 Remote Enable (1=Enable)
BOOL_IN[1].2 Blower 2 Remote Enable (1=Enable)
BOOL_IN[1].3
Blower 3 Remote Enable (1=Enable)
BOOL_IN[1].4
Blower 4 Remote Enable (1=Enable)
BOOL_IN[1].5
BOOL_IN[1].6 Local Mode Command from DCS
BOOL_IN[1].7
Remote Mode Command from DCS
BOOL_IN[1].8
Reset Alarms from DCS
BOOL_IN[1].9
Soft Run Command from DCS
Table 12-10. Blower Command (Double Integer)
Con fi guration Screen, the soft run command (BOOL_
IN[1].5) must be held HIGH in addition to the remote
permissive physical input.
Data that can be Written to the Blower PLC
To send commands to the Blower PLC, Control by Communications must be enabled from the Con fi guration screen
and the watchdog must show that communications between the Blower PLC and Central Controller/DCS are not
faulted. On a communication fault, the commands from the Central controller will stay in their last state/value in the
blower PLC.