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Siemens S7-200 “Modbus RTU” Omron E5CC Tutorial

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Hello friends!
Temperature control and storage is an increasingly necessary need for any business. The Omron E5CC temperature controller is one of the most used temperature controllers in the world for temperature control and monitoring.

Today will guide you to use Siemens S7-200 PLC to control and monitor Omron E5CC temperature through “Modbus-RTU” communication protocol.

Siemens S7-200 & Omron E5CC “Wiring Diagram”

Below is the RS485 communication wiring diagram between Siemens S7-200 PLC and Omron E5CC Temperature controller.

Note: If communication distance is long we need to use end resistor from 100 to 120Ω

Omron E5CC Modbus Parameters Setting

Below are the communication parameters that need to be set up to help Omron E5CC Controller communicate with Modbus RTU protocol.

Omron E5CC Modbus Registers Address
Note: Siemens S7-200 Holding Registers Address =
“VFD Address (Dec) + 40001

+ Temperature Setting Address = 40001 + 2103 (hex) =
= 40001 + 8451 (dec) = 48452 (dec)

+ Temperature Monitoring Address = 40001 + 2000 (hex) =
= 40001 + 8192 (dec) = 48193 (dec)

S7-200 Modbus Programming

+ Read/Write Distribution

+ Siemens S7-200 Modbus Configuration

+ Temperature Setting

+ Temperature Monitoring

Project Video Tutorial


+ Download STEP7 MicroWin V4.0 Siemens S7-200 Software
+ Download Omron E5CC Modbus Manual PDF

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