Process Image; Table 17: Control Byte; Table 18: Status Byte; Table 54: Control Byte - WAGO -I/O-SYSTEM 750 Manual

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Process Image

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6 Process Image
The first byte of the internal bus process image is:
The control byte in the process output direction
•
The status byte in the process input direction
•
The mailbox is static in the process image and is cross-faded when register
communication is on.
During register communication, the register query response is contained in the
status byte followed by 2 bytes of register data.
If the mailbox is active, status information of the I/O module is displayed
cyclically via the status byte.
Control byte

Table 17: Control Byte

Bit 7
0
0 = Read register
1
1 = Write register
* Reserved
Status byte

Table 18: Status Byte

Bit 7
0
1
(Bit 7)
GEN_ERR
CAN_ERR
TX_OVF
RX_OVF
INT_ERR
Bit 6
res.*
Bit 6 Bit 5
GEN_
ERR
Res.
0 Mailbox 0 active
1 Register communication enabled
0 No error on the CAN Bus.
1 Error on the CAN bus. Set when one of the bits 0...5 = 1.
0 No error on the CAN Bus.
1 Error on the CAN bus.
0 Send buffer OK.
1 Send buffer overflow (downstream). No data can be received by the I/O module.
0 Receive buffer OK.
1 Receive buffer overflow (upstream). No data can be received by the I/O module.
0 No internal error.
1 Internal error. Possible causes:
• 24V field supply missing
• Communication via mailbox and process data faulty
• Faulty parameterization request
• Faulty register request
Control byte
Bit 5 Bit 4 Bit 3
res.* res.* res.*
Register number
Status byte
Bit 4 Bit 3
CAN_
ERR
Register number
Version 1.2.0, valid from FW/HW-Version 01/01
WAGO-I/O-SYSTEM 750
750-658 CAN Gateway
Bit 2 Bit 1
res.* res.*
Bit 2 Bit 1
TX_ RX_
OVF OVF
Manual
Bit 0
res.*
Bit 0
INT_
ERR