Omron SYSMAC CS1W-SCB41-V1 User Manual

220
Protocol Conversion Section 6-5
6-5-5 Converting from FINS to Modbus-ASCII
Modbus-ASCII Slave-compatible devices connected serially to a PLC via
Modbus-ASCII can be accessed from the PLC using Modbus-ASCII com-
mands enclosed in FINS messages.
• Sent FINS message: FINS header + FINS command code 2805 hex +
Modbus-ASCII command
• Message after conversion: Modbus-ASCII command
System Configuration Patterns
Sending FINS Messages Using CMND(490) in CPU Unit’s Ladder Program
The Board/Unit converts the FINS messages to Modbus-ASCII protocol for
sending in this operation.
Access from CPU Unit (on the Same PLC)
Access from CPU Unit (on Network PLC)
2805
FINS message
FINS header Modbus-ASCII command
(Via network or CPU bus)
Modbus-ASCII command
Modbus-ASCII command
(RS-232C or RS-422A/485)
CPU Unit
(CMND(490)
instruction)
Modbus-ASCII command encapsulated
using FINS command 2805 hex
Serial Com-
munications
Unit/Board
Modbus-
ASCII Slave-
compatible
device
CPU Bus-to-Serial Details Routing tables to
treat serial
communications
path as network
Slaves connected serially to the Serial
Communications Board/Unit using Mod-
bus-ASCII can be accessed from a CPU
Unit in the same PLC.
Optional
2805
FINS header
CMND(490)
Modbus-ASCII command
Modbus-ASCII command
Serial Communications Unit/Board
FINS message
RS-485 (Modbus-ASCII)
CPU Unit
Protocol
conversion
Modbus-ASCII
Slave device
FINS message-to-Serial Details Routing tables to
treat serial
communications
path as network
Slaves connected serially to the Serial
Communications Board/Unit using Mod-
bus-ASCII can be accessed from a CPU
Unit in a PLC on the network.
Optional
2805
CMND(490)
FINS header
FINS message
Serial Communications Unit/Board
CPU Unit
RS-485 (Modbus-ASCII)
Modbus-ASCII
command
Modbus-ASCII
command
Protocol
conversion
Modbus-ASCII
Slave device
Network (Ethernet, Controller
Link, DeviceNet)

Omron SYSMAC CS1W-SCB41-V1 Specifications

General

Brand	Omron
Model	SYSMAC CS1W-SCB41-V1
Category	Network Hardware
Language	English