Monitors Grundfos E-pumps via internal CIM 200 Modbus interface
Overview
Template for the Grundfos CIM 200, a Modbus RTU communication interface module installed inside Grundfos E-pumps. It reads operational data such as liquid temperature, volume flow, RPM, motor current, alarms, and operation hours from a wide range of compatible pump models.
Key readings
Pump Liquid Temperature
Electronic Temperature
Volume Flow
RPM
Motor Current
Alarm
Use cases
Monitor pump liquid temperature and volume flow on a live cloud dashboard for remote HVAC oversight.
Create an alert when the CIM 200 reports an alarm condition so the installer can respond quickly.
Log motor current and RPM trends over time to detect early signs of pump wear or blockage.
Track cumulative operation hours across multiple Grundfos E-pumps to plan preventive maintenance schedules.
Compare electronic temperature readings across pump installations to identify units at risk of overheating.
Installation
1Install the CIM 200 module inside the Grundfos E-pump using the internal 10-pin connector, following the Grundfos installation manual.
2Wire the RS-485 Modbus RTU bus (A, B, and GND) from the CIM 200 terminal to the ModbusCloud gateway (MCG or MLP series).
3Set the Modbus slave address on the CIM 200 to a unique value that does not conflict with other devices on the bus.
4Confirm the baud rate is set to 19200 on both the CIM 200 and the ModbusCloud gateway.
5Import the Grundfos CIM 200 template in the ModbusCloud platform and assign it to the correct gateway and slave address.
6Verify that live readings such as pump liquid temperature, RPM, and motor current appear on the ModbusCloud dashboard.
Things to watch for
01
What baud rate should I use for the CIM 200?
The default baud rate is 19200. Make sure this matches the setting on the ModbusCloud gateway. If communication fails, double-check the parity and stop bit settings as well.
02
Why does the operation time value look incorrect?
Operation time is split across two 32-bit registers: OperationTimeHI at address 326 and OperationTimeLo at address 328. The template combines these automatically, but if registers are read out of order or partially, the value may appear wrong. Ensure both registers are polled in the same read cycle.
03
Can I control the pump speed or setpoint through this template?
No. The Grundfos CIM 200 template is read-only and does not include control registers. It is designed for monitoring pump status and operational data only.
04
Which Grundfos pump models are supported?
The template supports all Grundfos E-pumps that accept the CIM 200 module. This includes CRE, CRNE, CRIE, MTRE, CHIE, CME, TPE, TPE Series 2000, NBE, NKE, CUE drives, and MAGNA3 pumps.
Registers (10)
10 read / 0 write
Name
Address
Function
Type
Unit
Access
PumpLiquidTemp
321
FC04
uint16
°C
R
ElectronicTemp
320
FC04
uint16
°C
R
VolumeFlow m3
301
FC04
uint16
m³
R
Alarm
204
FC04
uint16
R
RPM
303
FC04
uint16
rpm
R
Frequency
304
FC04
uint16
Hz
R
MotorCurrent
308
FC04
uint16
A
R
RelativePerformance
302
FC04
uint16
%
R
OperationTimeHI
326
FC04
uint32
Hr
R
OperationTimeLo
328
FC04
uint32
Hr.
R
Working with Modbus in your projects?
ModbusCloud is the hardware-plus-software platform that installers use to monitor, visualise and control Modbus devices from one portal. This template is one of hundreds you can use right away.
