5. LADDER COMMUNICATION
IM9000F02-E2
39
5.1.3 Data read
Reads identifiers requested from the PLC by the corresponding number of data items. A response
from REX-F9000 is returned as 4-digit BCD data excluding the sign data and decimal point.
Number of data which can be read at a time : 1 to 30.
PLC send data
Number of bytes
1
1
2
2
2
1
1
Number of BCD
digits
2
2
4
4
4
2
2
Details
STX
(02H)
Device
addres
s
(ADR)
Identifier
(ID)
0001
Read
data
CR
(0DH)
LF
(0AH)
Command
Data (DAT)
(CMD)
REX-F9000 response under normal operation
Number of
bytes
1
1
2
2
2
2
2
Number of
BCD digits
2
2
4
4
4
4
4
Details
STX
(02H)
Device
address
(ADR)
Identifie
r
(ID)
0000
dddd1
0000
dddd2
Command
Data (DAT)
Data corresponding
(CMD)
to iden 1
2
2
1
1
4
4
2
2
0000
ddddn
CR
LF
Data corresponding to
iden n - 1 (n : Number of read data)
If there is no identifier requested by the PLC, the REX-F9000 returns the "0000" data.
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This numeric value changes
depending on the data sign
(+ or -). (0 or 1)
