Grundfos E-pumps (CIM 200 / CIM 500)

Name: Grundfos E-pumps (CIM 200 / CIM 500)
Brand: Grundfos
SKU: 6d55d41d-5213-46e4-b95c-6434b70cd8da

Monitors and controls Grundfos E-pumps and MAGNA3 circulators: head, flow, power, energy and alarms.

Grundfos E-pumps such as the CRE, TPE, NBE and NKE and the MAGNA3 circulator are speed-controlled pumps for irrigation, circulation and heating water, also in greenhouses, and connect to Modbus through a CIM 200 or CIM 500 module. This Modbus RTU template reads head, flow, power, energy, temperatures and alarm codes and lets you write start and stop, control mode and setpoint from ModbusCloud.

Protocol: Modbus RTU
Connection: RS485, 19200 baud
Registers: 161, read and write

Brand: Grundfos
Key readings: Head · Volume flow · Power consumption · Energy consumption · Motor speed · Pumped liquid temperature · Alarm and warning code · Operating hours
Available commands: Start and stop · Control mode · Setpoint · Operating mode · Maximum flow limit · Relay outputs
Compatible models: CRE · CRNE · CRIE · MTRE · CHIE · CME · TPE · TPE Series 2000 · NBE · NKE · CUE · MAGNA3 · CIM 200 Modbus RTU · CIU 200 Modbus RTU · CIM 500 Modbus TCP · CIU 500 Modbus TCP · SoftCIM Modbus RTU (MGE with FM310/311/110)
Last updated: 7 October 2026

Registers (161)

161 read, 73 write

Name	Unit	Access
Head	bar	Read
Volume Flow	m³/h	Read
Power	W	Read
Speed	rpm	Read
Frequency	Hz	Read
Relative Performance	%	Read
Motor Current	A	Read
Pumped Liquid Temperature	K	Read
Differential Pressure	bar	Read
Actual Setpoint	%	Read
User Setpoint	%	Read
Specific Energy Consumption		Read
DC Link Voltage	V	Read
Motor Voltage	V	Read
Load Percent	%	Read
Torque	Nm	Read
Remote Flow	m³/h	Read
Inlet Pressure	bar	Read
Outlet Pressure	bar	Read
Remote Pressure 1	bar	Read
Remote Pressure 2	bar	Read
Inlet Differential Pressure	bar	Read
Outlet Differential Pressure	bar	Read
Remote Differential Pressure	bar	Read
Feed Tank Level	m	Read
Storage Tank Level	m	Read
Remote Temperature 1	K	Read
Remote Temperature 2	K	Read
Remote Differential Temperature	K	Read
Ambient Temperature	K	Read
Aux Sensor Input	%	Read
Conductivity	µS/cm	Read
pH	pH	Read
Turbidity	NTU	Read
Heat Power	W	Read
Heat Differential Temperature	K	Read
Power Electronics Temperature	K	Read
Electronics Temperature	K	Read
Motor Temperature	K	Read
Bearing Temperature DE	K	Read
Bearing Temperature NDE	K	Read
Digital Inputs		Read
Digital Outputs		Read
Pump Status Word		Read
Alarm Code		Read
Warning Code		Read
Actual Control Mode		Read
Actual Operation Mode		Read
Process Feedback	%	Read
Control Source		Read
Drive State		Read
Flow Estimation State		Read
Bearing Service		Read
Feedback Sensor Unit		Read
Feedback Sensor Min		Read
Feedback Sensor Max		Read
Nominal Frequency	Hz	Read
Min Frequency	%	Read
Max Frequency	%	Read
Setpoint Range Min	%	Read
Setpoint Range Max	%	Read
Actual Kp		Read
Actual Ti	s	Read
Actual Direct Control		Read
Max Flow Limit	m³/h	Read
Control Register		Read and write
Control Mode Request		Read and write
Operation Mode Request		Read and write
Setpoint	%	Read and write
Max Flow Limit Setting	m³/h	Read and write
Relay Control		Read and write
Sensor Feedback	%	Read and write
Kp Setting		Read and write
Ti Setting	s	Read and write
Direct Control Setting		Read and write
Set Pump Clock		Read and write
Watchdog	s	Read and write
Auto Ack Control Bits		Read and write
Slave Minimum Reply Delay	ms	Read and write
Register Offset		Read and write
Software Defined Modbus Address		Read and write
Software Defined Bit Rate		Read and write
Software Defined Parity		Read and write
Software Defined Stop Bits		Read and write
GENIbus LED Off		Read and write
Energy	kWh	Read
Operating Time	h	Read
Powered Time	h	Read
Number of Starts		Read
Volume Direction 1	m³	Read
Volume Direction 2	m³	Read
Heat Energy Direction 1	kWh	Read
Heat Energy Direction 2	kWh	Read
Pump Clock		Read
GENIbus CRC Error Count		Read
GENIbus Data Error Count		Read
GENIbus TX Count		Read
GENIbus RX Count		Read
Actual Modbus Address		Read
CIM Version Number		Read
Unit Family		Read
Unit Type		Read
Unit Version		Read
Product Software Version HI		Read
Product Software Version LO		Read
Product Software Day Month		Read
Product Software Year		Read
Simulation Alarm Code		Read and write
Simulation Warning Code		Read and write
Simulation Activate		Read and write
Simulation Active		Read
User Register 1		Read and write
User Register 2		Read and write
User Register 3		Read and write
User Register 4		Read and write
User Register 5		Read and write
User Register 6		Read and write
User Register 7		Read and write
User Register 8		Read and write
User Register 9		Read and write
User Register 10		Read and write
User Register 11		Read and write
User Register 12		Read and write
User Register 13		Read and write
User Register 14		Read and write
User Register 15		Read and write
User Register 16		Read and write
User Register 17		Read and write
User Register 18		Read and write
User Register 19		Read and write
User Register 20		Read and write
User Register 21		Read and write
User Register 22		Read and write
User Register 23		Read and write
User Register 24		Read and write
User Register 25		Read and write
User Register 26		Read and write
User Register 27		Read and write
User Register 28		Read and write
User Register 29		Read and write
User Register 30		Read and write
User Register 31		Read and write
User Register 32		Read and write
User Register 33		Read and write
User Register 34		Read and write
User Register 35		Read and write
User Register 36		Read and write
User Register 37		Read and write
User Register 38		Read and write
User Register 39		Read and write
User Register 40		Read and write
User Register 41		Read and write
User Register 42		Read and write
User Register 43		Read and write
User Register 44		Read and write
User Register 45		Read and write
User Register 46		Read and write
User Register 47		Read and write
User Register 48		Read and write
User Register 49		Read and write
User Register 50		Read and write

Loading registers…

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Use cases

Show head, flow and power of all irrigation pumps on one dashboard and compare them per pump.
Send an email or webhook alert when the pump reports an alarm code, for example dry running or a blocked pump.
Track energy consumption and operating hours per pump in the history to plan maintenance.
Change the setpoint or control mode of a circulation pump from the portal, or lower it at night with a scheduled automation.
Follow the pumped liquid temperature and heat power of a heating circuit pump over 365 days of history.
Get an alert when the flow drops below a threshold while the pump runs, for example after a blocked filter.

Installation

Fit the CIM 200 module in the pump, or a CIU 200 box for a CUE drive, and set the Modbus address on the rotary switches SW6 and SW7.
Leave the DIP switches at 19200 baud, even parity and 1 stop bit, or set the speed and parity that your bus uses.
Connect D1 (positive) and D0 (negative) to the RS485 lines of the ModbusCloud Gateway with screened twisted pair. Switch on the termination only at both ends of the bus.
In ModbusCloud, add a Modbus device with the same address, 19200 baud, 8 data bits, even parity and 1 stop bit, and import this template.
Check that Speed and Unit Family show plausible values. If nothing answers, swap the two data wires.

Things to watch for

The pump does not answer on RS485. What should I check?

Check that address, baud rate and parity in ModbusCloud match the CIM 200. The default is 19200 baud, even parity and 1 stop bit, and the address comes from the rotary switches SW6 and SW7. A flashing red LED1 points to a speed, parity or wiring fault, so check the switches and swap D1 and D0 if needed. Switch on the termination only at the two ends of the bus.

Why do some registers show 65535?

65535 means the pump does not have that value. Many readings need a sensor on an analog input, such as inlet pressure, tank level or the external temperatures, and some only exist on newer MGE motors or on the MAGNA3. Set up the sensor on the pump, then restart the module so it picks up the sensor scaling.

Why does the liquid temperature read around 290?

The pump reports all temperatures in kelvin with two decimals. Subtract 273.15 for degrees Celsius, so 293.15 K is 20 °C. Inlet pressure and the tank levels carry a fixed offset too: subtract 1 bar from the inlet pressure and 100 m from the tank levels.

The pump ignores the setpoint I write. Why?

The pump only follows Modbus in remote mode. Write 3 to the Control Register for remote and start, or 1 for remote and stop, and check bit 8 of the Pump Status Word. Writing registers is off by default per gateway, so request it in the portal first. If you enable the watchdog, make its timeout longer than the polling interval, otherwise the pump falls back to local mode.

Does this also work with the CIM 500 over Ethernet?

Yes, the CIM 500 has the same registers over Modbus TCP. Set its protocol rotary switch to 1, give the Modbus TCP interface an IP address in the web server of the module (default 192.168.1.100) and connect it to the network of the ModbusCloud Gateway. Port 502 is always active and the unit ID is ignored.

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