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Message Communications Specifications Section 7-4
7-4 Message Communications Specifications
CPU Unit function CS/CJ Series
Unit model number CS1W-EIP21, CJ1W-EIP21, CJ2H-CPU@@-EIP, or CJ2M-CPU3@
Communications
instructions
Sending/ receiving
data
SEND and RECV instructions
FINS commands CMND(490) instruction
There are two kinds of FINS commands: commands addressed to the CPU
Unit, and commands addressed to the CS/CJ-series EtherNet/IP Unit or
built-in EtherNet/IP port.
Sending Ether-
Net/IP CIP UCMM
messages
CMND(490) instruction
Sends CIP UCMM messages to other companies’ masters/slaves, or PLCs
with a CS/CJ-series EtherNet/IP Unit or built-in EtherNet/IP port mounted.
Number of desti-
nation nodes
FINS message com-
munications
1:N communications
Explicit message
communications
1:N communications
Send functions: CIP unconnected (UCMM) communications only
Receive functions: CIP unconnected (UCMM) and CIP connected (Class 3)
communications
Transmission data
length (not includ-
ing the command
code)
FINS message com-
munications
• SEND: 990 words (1,980 bytes) max. normally, or 727 words (1,454 bytes)
max. when broadcasting
• RECV: 990 words (1,980 bytes) max.
• CMND: 1,990 bytes max. normally, or 1,462 bytes max. when broadcasting
(data after the FINS command code)
Explicit message
communications
CMND: 492 bytes max.
No. of simultaneous instructions One each for 8 ports (ports 0 to 7)
Refer to 3-25 Network Instructions in the CS/CJ Series Programmable Con-
trollers Instructions Reference Manual (W340) for information on ports (logi-
cal ports).
Response monitoring time Default setting: 2 s
User setting: 0.1 to 6553.5 s
Retries 0 to 15
Internetwork con-
nections
Same network type Supports internetwork communications between Ethernet networks con-
nected to CS/CJ-series EtherNet/IP Units and built-in EtherNet/IP ports (up
to 3 levels).
Different network
type
Supports internetwork communications between the EtherNet/IP network
connected to a CS/CJ-series EtherNet/IP Unit or built-in EtherNet/IP port
and other networks such as Controller Link or SYSMAC LINK (up to 3 lev-
els).
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