Precautions When Using Data Transfer Function - Panasonic FP7 User Manual

MEWNET-W

4.5.3 Precautions When Using Data Transfer Function

 Specifications of data transfer function:
• Using the data transfer function, communication can be performed between any units in
either PLC link mode or non-PLC link mode.
• For the FP7 MW Unit, one instruction can be executed for each one unit simultaneously.
• The maximum number of transmission data that can be specified is 55 words (SEND
instruction) and 56 words (RECV instruction) in W mode.
 Execution condition of SEND/RECV instructions:
• Start the SEND/RECV instruction (message communication) in the W mode of FP7 MW Unit
after any of the following steps.
Confirm that the PLC link transmission assurance relays of the destination unit to send a message or all
①
units are ON.
Confirm that the information bit of the units being added to the link of the destination unit is ON. The
②
information on the units added to the link can be monitored by PMGET instruction.
③
After a certain period of time after power-on (After a few seconds)
• Use the UNITSEL instruction following the SEND/RECV instruction to specify a target slot
number for communication. Specify U0 for [S2] port number.
• Confirm that the "master communication clear to send flag" is ON, and execute the
SEND/RECV instruction.
• Confirm that the "master communication send active flag" is OFF, and execute the
SEND/RECV instruction. For the FP7 MW Unit, one instruction can be executed for each
one unit simultaneously.
• SEND and RECV instructions cannot be executed for the FP7 MW Units during the slave
communication.
KEY POINTS
The information on PLC link transmission assurance relays and units added
•
to the link can also be read by a user program (PMGET instruction). Refer to
"9.1.4 PMGET Instruction (For MEWNET-W2)".
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