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User Manual
Section 5
GFK-2958L
May 2021
Detailed Description of I/O Modules
267
Action
Input Byte 0 (Status) of
Module
Input
Byte1
(length
of RX
byte
seg.)
Output byte 0 (control) off the
module
Output
byte 1
(length
of TX
byte
seg.)
Notes
7
6
5
4
3
2
1 0
7
6
5
4 3 2 1 0
Stat
TX_CNT_
ACK
RX_CNT
STATR
ES
RX_CNT_ACK
TX_CN
T
Init/
Startup
1
0
0
0
0
0
0 0 0
0
0
0
0 0 0 0 0 0
After
power-up,
module is
ready for
communica
tion
Activat
e
commu
nicatio
n
1
0
0
0
0
0
0 0 0
1
0
0
0 0 0 0 0 0
PLC is ready
for
communica
tion
(response)
Receive
data
1
0
0
0
1
0
0 0
N
(1 ..14)
1
0
0
0 0 0 0 0 0
Module has
received
bytes
1
0
0
0
1
0
0 0 N
1
0
1
0 0 0 0 0 0
RX
acknowledg
e after data
taken over
Send
data
1
0
0
0
1
0
0 0 X
1
0
1
0 1 0 0 0
N
(1...14)
Before
changing
TX-CNT, set
TX bytes
1
0
1
0
1
0
0 0 X
1
0
1
0 1 0 0 0 N
TX
acknowledg
e after
module sent
data