Busklemmen • 11
750-650 (/xxx-xxx) [Serial Interface RS 232 C]
WAGO-I/O-SYSTEM 750
Busklemmen
2.1.1.8 Process Image
Using the I/O module 750-650, a 6 byte input and output process image can be
transferred to the fieldbus coupler / controller via one logical channel. The
transfer of the data to be transmitted and the received data is made via 5
output and 5 input bytes (D0 ... D4). 1 Control byte (C) and 1 Status byte (S)
are used to control the floating data.
Attention
The representation of the process data of some I/O modules or their variations
in the process image depends on the fieldbus coupler/-controller used. Please
take this information as well as the particular design of the respective
control/status bytes from the section "Fieldbus Specific Design of the Process
Data" included in the description concerning the process image of the
corresponding coupler/controller.
Up to 5 characters which have been received via interface can be stored in the
input bytes. The output bytes will contain the characters to be sent.
Input data
Output data
S
Status byte
C
Control byte
D0
Input byte 0
D0
Output byte 0
D1
Input byte 1
D1
Output byte 1
D2
Input byte 2
D2
Output byte 2
D3
Input byte 3 *), **)
D3
Output byte 3 *), **)
D4
Input byte 4 **)
D4
Output byte 4 **)
*) with variations with 4 Data bytes, **) with variations with 5 Data bytes
Control byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
OL 2
OL 1
OL 0
0
IR
RA
TR
TR Transmit
request
RA
Receive acknowledge
IR
Initialization request
OL 0,
OL 1,
OL 2
Output length (number of characters to be sent, which have been stored in the
output bytes)
0
Constant value must always be 0.
