901
3. Instructions
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Network Instructions
3
Network Instructions
Network Instructions
Network Instructions
Overview of Network Communications Instructions
The network instructions can be divided into two types, SEND(090)/SEND2(491)/RECV(098)/RECV2(492)
and CMND(490)/CMND2(493). These instructions are transmitted between Units (CPU Units, CPU Bus
Units, and computers) in a network to transfer data and control operation, such as changing the
operating mode.
The commands executed by the network instructions are known as “FINS commands” and are used for
communications between FA control devices. (Refer to the CS/CJ Series Communications Commands
Reference Manual (Cat. No. W342) for details on FINS commands.) With FINS commands it is possible
to communicate (by the command/response format) with any Unit in any network or on the CPU Rack
itself just by specifying the network address, node number, and unit number of the destination Unit.
In the following example, a FINS command is sent to the CPU Unit through node number 2 in network
address 00.
Message content Instruction Operation
Commands to
transmit/receive data
(FINS command)
SEND(090)/SEND2(491)
RECV(098)/RECV2(492)
Arbitrary commands
(FINS command)
CMND(490)/CMND2(493)
Network address: Address of the network (local network = 00 hex)
Node number: Logical address in the network
Unit address: Unit address of the destination Unit
• CPU Unit: 00 hex
• CPU Bus Unit: Unit number + 10 hex
• Special I/O Unit: Unit number + 20 hex
• Inner Board: E1 hex
• Computer: 01 hex
Data reception
CPU Unit
Other device
CPU Unit,
CPU Bus Unit or
computer
Data transmission
SEND(090),
SEND2(491),
RECV(098), or
SECV2(492)
CMND(490) or
CMND2(493)
Command sent
Other deviceCPU Unit
Response returned
CPU Unit,
CPU Bus Unit, or
computer
Network address 01
CPU Unit (Rack)
Node number 2
Node number 1
Network address 00
(local network)
To Next Page
Loading...
Need help?
General
