D-50
FX Series PLC User's Manual - Data Communication Edition
Computer Link
7 Commands
7.1 BR Command [Reads Device Memory in 1-Bit Units]
7.1 BR Command [Reads Device Memory in 1-Bit Units]
This section explains the control procedure specification method and specification example when the bit
device memory is read all at once.
1. Specification method
The specification method in the control procedure format 1 is shown below:
1) Specify the device point range while satisfying the following conditions:
-1 ≤ Number of device points ≤ 256
*1
(Use "00H" to specify 256 points.)
- Head device number + Number of device points -1 ≤ Maximum device number
2) Express the station number, PLC number, number of device points and sum check code in hexadecimal.
*1. 54 in the FX
1S and FX0N Series
2. Specification example
When reading the contents of five devices X040 to X044 in the PLC whose station number is 5 (while the
message waiting time is set to 100 ms)
(When X040 and X043 are OFF and X041, X042 and X044 are ON)
Important point
The message wait time is specified in 10-ms units within the range from 0 to 150 ms, and expressed in
hexadecimal within the range from 0 to FH. For example, "100 ms" is expressed as "A".
BR
S
T
X
Station
No.
PLC No.
*
E
T
X
Character area B
Batch read command (unit: bit)
Head device
(5 characters)
Read device range
specification
"0 (30H)" indicates the OFF
status.
"1 (31H)" indicates the ON
status.
Character area A
Computer side
PLC side
E
N
Q
Station
No.
PLC No.
Sum check
code
A
C
K
Sum check
code
Message
wait time
Number of device points
(2 characters (hexadecimal)
* Data on specified number of device points
(Characters of specified number of device points)
Station
No.
PLC No.
E
N
Q
This range is regarded as the
sum check target.
This range is regarded as the
sum check target.
35
H
30
H
0 5
05
H
Indicates that X044 is
ON.
Indicates that X042 is
ON.
Indicates that X043 is
OFF.
Indicates that X040 is
OFF.
Indicates that X041 is
ON.
Computer side
PLC side
46
H
46
H
F F
52
H
42
H
B R A
41
H
30
H
58
H
X0040
34
H
30
H
30
H
35
H
30
H
0 5
37
H
34
H
4 7
S
T
X
02
H
35
H
30
H
0 5
46
H
46
H
F F
31
H
30
H
01101
30
H
31
H
31
H
E
T
X
35
H
30
H
0 5
03
H
A
C
K
06
H
35
H
30
H
0 5
46
H
46
H
F F
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