Specifications

1 - 9
1.4 System Configuration of PLC to PLC Network
This section explains different system configurations that are available with the PLC to
PLC network of the MELSECNET/H.
REMARK
The following functions are changed or added in the function version B of network
module.
(1) Functions added
Function Description
Multiple CPU system
supported
Multiple CPU systems are supported.
Addition of special link
instructions
(4 instructions)
RRUN instruction (Remote RUN instruction)
RSTOP instruction (Remote STOP instruction)
RTMRD instruction (Other station's clock data read
instruction)
RTMWR instruction (Other station's clock data write
instruction)
(2) Functions changed
Function Description
Data length of special link
instructions increased to
960 words
The data length of the following special link instructions was
increased from 480 words to 960 words.
Target dedicated instructions: SEND, RECV, RECVS, READ,
SREAD, WRITE, SWRITE
The function version of network module is indicated on the rating plate
attached to the side of the network module.
MADE IN JAPAN
LISTED 80M1
IND. CONT. EQ.
DATA LINK UNIT
MODEL QJ71LP21
SERIAL 020420000000000-B
Function version