Grundfos CIU 501 Instructions

English (GB)
9
5.5 Status LEDs
The CIM 200 Modbus module has two LEDs.See fig. 7.
• Red/green status LED (LED1) for Modbus communication
• Red/green status LED (LED2) for internal communication
between the CIM 200 and the Grundfos product.
LED1
LED2
Status Description
Off No Modbus communication.
Flashing green Modbus communication active.
Flashing red Fault in the Modbus communication.
Permanently red
Fault in the CIM 200 Modbus
configuration.
Status Description
Off The CIM 200 has been switched off.
Flashing red
No internal communication between the
CIM 200 and the Grundfos product.
Permanently red
The CIM 200 does not support the
Grundfos product connected.
Permanently green
Internal communication between the
CIM 200 and the Grundfos product is OK.
Note
During start-up, there may be a delay of up to
5 seconds before the LED2 status is updated.

Grundfos CIU 501 Specifications

General

Brand	Grundfos
Model	CIU 501
Category	Controller
Language	English