Device Read Block - Mitsubishi Electric MELSEC iQ-F Series FX5 User Manual

Device Read Block

The examples shown in this section explain the control procedure for reading by randomly specifying multiple blocks, where 1
block consists of n point(s) of a bit device memory (one point is specified by 16-bit) and a word device memory (one point is
specified by 1-word).
Data array in the character area during the device read block
This section explains how data is ordered in the character areas during device read block.
■When communicating data in ASCII code
(Request data)
(Data name)
External
equipment
H - - L H - - L H L H L
(Data name)
PLC CPU
H - - L H - - L
Total number of each block of the read word device data
■When communicating data in binary code
(Request data)
(Data name)
External
equipment
L H L H
(Response data)
(Data name)
PLC CPU
L
Total number of each block of the read word device data
H - - - - L H - - L
Specify the target device to be read.
(1st block)
Specify the target device to be read. (for the specified number of word device blocks)
H - - - - L H - - L
Specify the target device to be read.
(1st block)
Specify the target device to be read. (for the specified number of bit device blocks)
- - - - - -
H - - L
- - -
L - H L H L - H
Specify the target Specify the target
device to be read. device to be read.
(1st block) (nth block)
Specify the target device to be read. (for the
specified number of word device blocks)
- - - - - -
H L H L H
- - -
H - - - - L H - - L
Specify the target device to be read.
(nth block)
- - -
H - - - - L H - - L
Specify the target device to be read.
(mth block)
- - -
H - - L H - - L H - - L
Total number of each block of the read bit device data
L H L - H L H L - H L H
Specify the target
device to be read.
(1st block)
Specify the target device to be read. (for the
specified number of bit device blocks)
- - -
L H L H L H
Total number of each block of the read bit device data
- - -
H - - L H - - L
- - -
L - H L H
Specify the target
device to be read.
(mth block)
- - -
L H L H
4 COMMANDS
4.2 Device Access
4
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