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Network Instructions Section 3-25
3-25 Network Instructions
3-25-1 About SYSMAC NET Link/SYSMAC LINK Operations
The network instructions can be divided into two types, SEND(090)/
RECV(098) and CMND(490). 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
for details on FINS commands.) With FINS commands it is possible to com-
municate (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.
1,2,3... 1. Network address:
Address of the network (local network = 00)
2. Node number
Logical address in the network
3. Unit number
Unit number of the destination Unit
a) CPU Unit: 00
b) CPU Bus Unit: Unit number +10 hexadecimal
c) Special I/O Unit (except for C200H-series Special I/O Units):
Unit number +20 hexadecimal
Instruction Message content Operation
SEND(090)/
RECV(098)
Commands to transmit/
receive data
(FINS command)
CMND(490) Arbitrary commands
(FINS command)
Data reception
CPU Unit
Other device
CPU Unit,
CS1 CPU Bus Unit or
computer
Data transmission
SEND(090) or
RECV(098)
CMND(490)
Command sent
Other deviceCPU Unit
Response returned
CPU Unit,
CS1 CPU Bus Unit, or
computer
Network address 01
CPU Unit (Rack)
Node number 2
Node number 1
Network address 00
(local network)
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