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Operating and Maintenance Instructions
Appendix F – Modbus Holding Registers for Individual Fan Monitoring
These Modbus registers contain the same individual fan parameter values as shown on the LCD display. A "2
Fan Array" is used as an example in the table below. This set of registers scales up and down depending on the
total connected fans:
Parameter
ADDR
Nº
(hex)
Parameter 1
CB00
CB01
Parameter 2
CB02
CB03
Parameter 3
CB04
CB05
Parameter 4
CB06
CB07
Parameter 5
CB08
CB09
Parameter 6
CB0A
CB0B
Parameter 7
CB0C
CB0D
Parameter 8
CB0E
CB0F
Parameter 9
CB10
CB11
Parameter
CB12
10
CB13
CB14
Parameter
CB15
11
CB16
CB17
* See Table 9 below for information about the fan alarm and fan warning registers
** Parameter 11 is the "Sensor Reading" which is a 32-bit value comprised of two 16-bit (high and low) values. This parameter is only
available when using the fan as a sensor input
For parameters 1 to 10, the equation below can be used to derive the Modbus Address (in decimal):
Modbus Address = 51967 + (Parameter Number * Total Fans) - (Total Fans – Fan Number)
For parameter 11, the following equations can be used to derive the Modbus Address (in decimal) of the high and low components for
each fan:
Modbus Address Sensor Reading High = 51967 + (10 * Total Fans) + (Fan Number * 2) - 1
Modbus Address Sensor Reading Low = 51967 + (10 * Total Fans) + (Fan Number * 2)
NOTE: Do not to read/write more than 14 consecutive registers at a time, otherwise a Modbus
210-OMI14229-Iss8.1
© ebm-papst UK Ltd 2021
FAN 1 - FAN STATUS (0= No Comms, 1= Healthy, 2= Alarm, 3= Warning)
FAN 2 - FAN STATUS (0= No Comms, 1= Healthy, 2= Alarm, 3= Warning)
FAN 1 – ALARM REGISTER *
FAN 2 – ALARM REGISTER *
FAN 1 – WARNING REGISTER *
FAN 2 – WARNING REGISTER *
FAN 1 - POWER (W)
FAN 2 - POWER (W)
FAN 1 - SPEED (RPM)
FAN 2 - SPEED (RPM)
FAN 1 - RPM LIMIT (RPM)
FAN 2 - RPM LIMIT (RPM)
FAN 1 - MOTOR TEMPERATURE (ºC)
FAN 2 - MOTOR TEMPERATURE (ºC)
FAN 1 - ELECTRONICS TEMPERATURE (ºC)
FAN 2 - ELECTRONICS TEMPERATURE (ºC)
FAN 1 - HOURS RUN (hours)
FAN 2 - HOURS RUN (hours)
FAN 1 – SPEED SETPOINT (0-100%)
FAN 2 – SPEED SETPOINT (0-100%)
FAN 1 - SENSOR READING HIGH (0-65535) **
FAN 1 - SENSOR READING LOW (0-65535) **
FAN 2 - SENSOR READING HIGH (0-65535) **
FAN 2 - SENSOR READING LOW (0-65535) **
Table 8 – Controller's Dedicated Modbus Holding Registers Part 2
Exception Response will occur.
CN1116 Full OMI
Chelmsford Business Park Chelmsford Essex CM2 5EZ
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DESCRIPTION (Locally Stored Registers)
Page 37 of 47
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