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Operating and Maintenance Instructions
C.3 Remote Speed Control – Individual Fans
To remotely control the speed of a single fan in the array, the controller must be first set to "Monitor & Control"
operating mode and then to "Modbus Relay" operating mode. Please see Appendix G – Example of Modbus
Relay Operation for more information.
Appendix D – Modbus Input Registers
The purpose of the registers below is for remote monitoring of the fan array status and system statuses such as
total power consumption and total volume or pressure.
ADDR (hex)
0
1
2
FANS WITH NO COMMS
3
FANS WITH WARNINGS
4
5
6
CONSUMPTION HIGH
7
CONSUMPTION LOW BYTES
8
SETPOINT HIGH BYTES
9
SETPOINT LOW BYTES
TOTAL VOLUME/PRESSURE
A
TOTAL VOLUME/PRESSURE
B
CONTROLLER UPTIME HIGH
C
CONTROLLER UPTIME LOW
D
* If "Unit Type = Pressure" and "Measurement Unit = Imperial" then the value is presented as (INWG x 1000)
NOTE: Do not to read/write more than 14 consecutive registers at a time, otherwise a Modbus
210-OMI14229-Iss8.1
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Locally Stored Input Registers
DESCRIPTION
TOTAL FANS
FANS WITH ALARMS
NUMBER OF FAILED
SENSORS
FAN ARRAY SPEED
SETPOINT
TOTAL POWER
BYTES
TOTAL POWER
CONSTANT
VOLUME/PRESSURE
CONSTANT
VOLUME/PRESSURE
HIGH BYTES
LOW BYTES
BYTES
BYTES
Table 6 - Modbus Input Registers
Exception Response will occur
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NUMBER OF FANS ADDRESSED AND CONNECTED TO THE CONTROLLER
NUMBER OF FANS DISPLAYING ONE OR MORE ALARM CONDITION
NUMBER OF FANS NOT RESPONDING TO MODBUS MESSAGES FROM
THE CONTROLLER
NUMBER OF FANS DISPLAYING ONE OR MORE WARNING CONDITIONS
NUMBER OF FAILED SENSORS (APPLICABLE ONLY WHEN USING ONE OR
MORE SENSORS AT "FAN SENSOR INPUT")
FAN ARRAY SPEED SETPOINT (0-100%)
THE HIGHER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE TOTAL POWER CONSUMPTION OF THE FAN ARRAY (W)
THE LOWER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE TOTAL POWER CONSUMPTION OF THE FAN ARRAY (W)
THE HIGHER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE CONSTANT VOLUME/PRESSURE SETPOINT (0-65535)
THE LOWER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE CONSTANT VOLUME/PRESSURE SETPOINT (0-65535)
THE HIGHER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE SENSOR READING IN m3/h, CFM, Pa or INWG (0-65535)
THE LOWER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE SENSOR READING IN m3/h, CFM, Pa or INWG (0-65535)
THE HIGHER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE CONTROLLER UPTIME COUNTER (IN SECONDS)
THE LOWER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE CONTROLLER UPTIME COUNTER (IN SECONDS)
CN1116 Full OMI
DETAILS
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