2.6 Communications with a Mitsubishi PLC (A-compatible 1E Frame protocol)
Message Functions
2-135
Function Code (PARAM12)
This parameter gives the function code that was received.
Note: 1. B: Bit data, W: Integer data
2. AnCPU special instructions cannot be used. Use the ACPU common instructions to access the AnCPU. The
extended file registers in the AnCPU cannot be accessed either.
Reserved for System (PARAM13)
This parameter is used by the system.
Data Address (PARAM14 and PARAM15)
These parameters give the data address that was requested by the remote station.
Register Type (PARAM16)
This parameter is not used for the A-compatible 1E Frame protocol.
Data Size (PARAM17)
This parameter gives the data size as the number of bits or words for read/write requests from the remote
station.
Remote CPU Module Number (PARAM18)
This parameter is not used for the A-compatible 1E Frame protocol.
Reserved for System (PARAM19)
This parameter is used by the system.
Function Code
Common
Instructions for
MELSEC ACPUs
Target
Data
Type
Function
01 or 02 hex 00 hex B Reads bit devices in units of one point.
03, 04, 09, or 0A hex 01 hex W Reads word devices in units of one point.
05 or 0F hex 02 hex B Writes bit devices in units of one point.
06, 0B, or 10 hex 03 hex W Writes word devices in units of one point.
08 hex 16 hex
−
Performs a loopback test.
0E hex 05 hex B
Sets/resets word devices in units of one point by speci-
fying a device number.
31 hex 60 hex W Writes to a fixed buffer in units of one word.
32 hex 61 hex W
Reads from the random access buffer in units of one
word.
33 hex 62 hex W Writes to the random access buffer in units of one word.
Do not change the value of PARAM13 from a user program or by any other means.
Do not change the value of PARAM19 from a user program or by any other means.
To Next Page
Loading...
