11.6 CIU 500 Modbus TCP communication setup
Step Action
1 Check that both CIU 500 unit and the E-pump are powered off.
2 Remove the front cover of CIU 500.
3 Select position 1 at the CIM 500 module protocol rotary switch.
4
Connect the GENIbus cable from CIU 500 to the E-pump. See the "CIU, Communication Interface Unit installation and operating instructions" or
see the CIU quick guide.
5 Power on CIU 500 and the E-pump, and observe LED2 turn permanently green and LED1 remaining off.
6 Connect one of the CIU 500 Ethernet ports (RJ45) to a PC using an Ethernet cable.
7 Configure the PC Ethernet port to the same subnetwork as CIM 500, for example 192.168.1.1, and the subnet mask to 255.255.255.0.
8
Open your internet browser and make contact to the CIM 500 webserver.
Default: 192.168.1.100.
9
Log on to the webserver. Default:
User: admin
Password: Grundfos.
10 In the menu column to the left select: Configuration > Real time Ethernet protocol
11 Type in an IP address belonging to the same subnet as your PC, for example 192.168.1.2.
12 Type in the subnet mask 255.255.255.0, and leave the rest of the settings at their factory default values.
13 Click [Submit] to transfer the new settings, and close the internet browser.
CIM 500 is now ready to be accessed from a Modbus TCP master via one of its Ethernet ports. Use the IP address selected under step 10. The Modbus address
(Unit ID) in the Modbus TCP telegram is not used.
CIU 500 LED1 will be flashing green when Modbus TCP communication takes place.
You can use the two Ethernet ports to daisy chain CIM 500 modules.
It is possible to have connection to the webserver simultaneously with a connection to a Modbus TCP master.
It is possible to have connection to more Modbus TCP masters simultaneously, for example to have connection to PC Tool CIM/CIU while connected to another
Modbus TCP master.
Related information
7.2 Setting the Industrial Ethernet protocol
12. Detailed descriptions of functionality
12.1 APN
12.1.1 What is APN and Modbus TCP?
An APN connection (Access Point Name) is a wireless, "always on" connection that remains active as long as CIU 260 is within range of the
service. With a data connection, it is possible to establish a wireless connection to the Internet and thus enable a remote connection to a
SCADA system computer or another PC application.
The APN connection itself takes care of the wireless data transfer via the cellular network. It plays the same role as Ethernet in a wired
network. We will refer to an APN connection as a data connection, and it also makes use of the TCP/IP protocol, which enables easy
integration with the Internet. The Modbus TCP protocol is used on the application layer communicating with a TCP port number (default 502).
The difference when compared to the fieldbus protocol Modbus RTU is the exclusion of the 16-bit CRC checksum and the adding of a Modbus
application program header as illustrated.
Modbus RTU telegram
Slave ID
Function
code ID
Data
CRC
Modbus application program header
Transaction ID
Protocol ID
Length
Unit ID
Function
code ID
Data
Modbus TCP/IP application data unit
Modbus TCP/IP data
TM044907
Modbus TCP telegram
12.1.2 Subscription
You have to select the service provider and the technical solution that best suits your system, and it must be based on static IP addressing.
You will get the following from the service provider:
• A Subscriber Identity Module (SIM card).
• An Access Point Name (APN), for example "Internet".
• A fixed user name that cannot be changed by the user.
• A fixed password that cannot be changed by the user.
• A static IP address.
Solutions based on a VPN, Virtual Private Network, involve the use of special routers, for example GRE, Generic Routing Encapsulation,
routers, which you also get from the service provider.
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