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Modbus Slave configuration with ET 200S 1SI Module - difference between function code FC03 and FC04

9/1/2010 11:53 AM	Rate (0)
Fredi1972 Posts: 1 Rating: (0)	Pravin Patil India Dear All, I am using ET200S 1SI Modbus CP MLFB No. 6ES7-138-4DF11-0AB0 I want configure it for modbus Slave. In my application I need to transfer my data to a third patry which is Modbus RTU master (PORT RS485) So I need to configure myself as slave Can you please help in doing this? Thankx & regards Praveen Patil Hello, I have the same setup. I would like to send data from a DB and receive data to a DB. What is the difference between function code FC03 and FC04? Do I need to have one S_MODB for sending data and one for receiving?
Fredi1972 Posts: 1 Rating: (0)	Last edited by: CS Moderator at: 9/2/2010 3:01 PM new subject after splitting referred posting inserted
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9/1/2010 2:45 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 3/14/2025 Posts: 12344 Rating: (2707)	Hello Fredi; What is the difference between function code FC03 and FC04? Modbus was originally developped for communictaions between Modicon PLCs, so it uses Modicon bit and register addresses. Each function Code accesses a distint memory area in the PLC, represented by a different base address. There are: -output coils (base address 00000) used by FC01 (read), FC05 (Write)and FC15 (write multiple) -internal coils (base address 10000) used by FC02 (read) - input registers (base address 30000) used by FC04 (Read) - internal and outputregisters (base address 40000) used by FC03 (read), FC06 (write), FC16 (write multiple) The attachment is extracted from this document, with modifications for address entry. http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b.pdf Hope this helps, Daniel Chartier Attachment Modbus codes.JPG (181 Downloads)

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