Operating and Maintenance Instructions
210-OMI14229-Iss8.1
CN1116 Full OMI
Page 32 of 47
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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.
Locally Stored Input Registers
ADDR (hex)
DESCRIPTION
DETAILS
0
TOTAL FANS
NUMBER OF FANS ADDRESSED AND CONNECTED TO THE CONTROLLER
1
FANS WITH ALARMS
NUMBER OF FANS DISPLAYING ONE OR MORE ALARM CONDITION
2
FANS WITH NO COMMS
NUMBER OF FANS NOT RESPONDING TO MODBUS MESSAGES FROM
THE CONTROLLER
3
FANS WITH WARNINGS
NUMBER OF FANS DISPLAYING ONE OR MORE WARNING CONDITIONS
4
NUMBER OF FAILED
SENSORS
NUMBER OF FAILED SENSORS (APPLICABLE ONLY WHEN USING ONE OR
MORE SENSORS AT “FAN SENSOR INPUT”)
5
FAN ARRAY SPEED
SETPOINT
FAN ARRAY SPEED SETPOINT (0-100%)
6
TOTAL POWER
CONSUMPTION HIGH
BYTES
THE HIGHER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE TOTAL POWER CONSUMPTION OF THE FAN ARRAY (W)
7
TOTAL POWER
CONSUMPTION LOW BYTES
THE LOWER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE TOTAL POWER CONSUMPTION OF THE FAN ARRAY (W)
8
CONSTANT
VOLUME/PRESSURE
SETPOINT HIGH BYTES
THE HIGHER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE CONSTANT VOLUME/PRESSURE SETPOINT (0-65535)
*
9
CONSTANT
VOLUME/PRESSURE
SETPOINT LOW BYTES
THE LOWER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE CONSTANT VOLUME/PRESSURE SETPOINT (0-65535)
*
A
TOTAL VOLUME/PRESSURE
HIGH BYTES
THE HIGHER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE SENSOR READING IN m3/h, CFM, Pa or INWG (0-65535)
*
B
TOTAL VOLUME/PRESSURE
LOW BYTES
THE LOWER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE SENSOR READING IN m3/h, CFM, Pa or INWG (0-65535)
*
C
CONTROLLER UPTIME HIGH
BYTES
THE HIGHER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE CONTROLLER UPTIME COUNTER (IN SECONDS)
D
CONTROLLER UPTIME LOW
BYTES
THE LOWER 16-BITS OF A 32-BIT UNSIGNED INTEGER REPRESENTING
THE CONTROLLER UPTIME COUNTER (IN SECONDS)
Table 6 - Modbus Input Registers
*
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
Exception Response will occur
