English (GB)
4
3. System description
3.1 Modbus
The system diagrams provide an overview for the different
technologies of how to connect the CIU to the Grundfos MP 204
(electronic motor protector, connected to a Grundfos pump) that
is to be connected to a Modbus network.
CIU
The CIU solution is a box with a power supply module and a
CIM Modbus module. It can either be mounted on a DIN rail or on
a wall.
3.2 CIU 200 Modbus RTU
The CIU 200 offers a Modbus RTU connection to the MP 204.
Fig. 1
Grundfos SP pump connected to an MP 204 which is
then connected to Modbus RTC via a CIU 200
3.3 CIU 250 Modbus GSM/GPRS
Remote communication via the CIU 250 can be established by
using one of the following options:
• Modbus RTU protocol via a GSM connection
• Modbus TCP protocol via a GPRS connection
• SMS commands from a mobile phone.
Fig. 2
CIU 250 solution for the MP 204 connected to an SP
pump
3.4 CIU 500 Modbus TCP
The CIU 500 offers a Modbus TCP connection to the MP 204.
Fig. 3
Grundfos SP pump connected to an MP 204 which is
then connected to Modbus TCP via a CIU 500
TM
04
42
88
1
1
0
9
TM
04
74
44
06
10
Note
3G/4G are not supported via CIU 250.
MP 204
motor
protector
CIU
Pump
Modbus RTU
GENIbus
RS-485
MP 204 motor
protector
Pump
CIU 200
Modbus
RTU
GENIbus
RS-485
GSM/GPRS
CIU 250
Pump
MP 204
motor
protector
GENIbus
RS-485
TM0
4
428
8
11
09
MP 204
motor
protector
CIU
Pump
Modbus RTU
GENIbus
RS-485
MP 204 motor
protector
Pump
CIU 500
Modbus
TCP
GENIbus
RS-485