2.7 Communications with a Mitsubishi PLC (QnA-compatible 3E Frame Protocol)
Message Functions
2-173
Param (First Address of Parameter List)
Specify the first address of the parameter list.
A total of 52 words starting from the specified first word are automatically used for the parameter list. The
parameter list is used by inputting the connection number and relevant parameter data. It is also where the
process results and status are output.
Busy
Specify the bit that shows that the message reception is in progress.
The Busy Bit is ON while a message reception or abort is in progress.
Keep the Execute Bit or Abort Bit turned ON while the Busy Bit is ON.
Complete
Specify the bit that shows when the message reception has been completed.
The Complete Bit turns ON only for one cycle when message reception or forced abort processing has
been completed normally.
Error
Specify the bit that shows if an error occurred during message processing.
When an error occurs, the Error Bit will turn ON only for one scan.
The following diagrams show timing charts for the bit I/O items in the MSG-RCVE function.
A parameter list with the first address set to DA00000 is shown below.
PARAM00
PARAM01
PARAM02
PARAM03
PARAM04
PARAM05
PARAM06
PARAM07
PARAM46
PARAM47
PARAM48
PARAM49
PARAM50
PARAM51
DW00000
DW00001
DW00002
DW00003
DW00004
DW00005
DW00006
DW00007
DW00046
DW00047
DW00048
DW00049
DW00050
DW00051
Registers
Parameter List
F xxx xxxx xxxx xxx 0
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