Omron E5CN Manual

5-1
SECTION 5
Modbus Communications
Procedure
Read this section if you are to communicate using the Modbus format.
5.1 Data Format.................................................................. 5-2
Command Frame...................................................5-2
CRC-16 Calculation Example................... 5-3
Response Frame ................................................... 5-4
Normal Response Frame ......................... 5-4
Error Response Frame............................. 5-4
Error Codes ........................................................... 5-5
No Response............................................ 5-5
5.2 Function List ................................................................. 5-6
5.3 Variable Area ................................................................5-7
Addresses ................................................ 5-7
Number of Elements.................................5-8
Set Values ................................................ 5-8
5.4 Detailed Description of the Services............................. 5-9
Read Variable Area ............................................... 5-9
Write Variable Area .............................................5-11
Operation Commands .........................................5-14
Echoback Test..................................................... 5-19

Omron E5CN Specifications

General

Communication	RS-485 (optional)
Mounting	Panel Mount
Control Method	ON/OFF
Input Type	Thermocouple, RTD
Supply Voltage	100 to 240 VAC
Output Type	Relay, Voltage (for driving SSR), Current
Display Type	7-segment LED
Size	48 x 48 mm
Control Output	Relay, Voltage (for driving SSR), Current
Alarm Output	1 or 2 outputs
Dimensions	48 x 48 x 78 mm
Ambient Operating Temperature	-10 to 55°C
Protection Rating	IP66