34
Process Image
WAGO-I/O-SYSTEM 750
750-657 IO-Link Master
Manual
Version 1.0.2, valid from FW/HW-Version 02/01
6.1
Control/status byte
The first byte of the internal bus process image is reserved for the control byte
(data direction fieldbus coupler/controller
IO-Link master) or status byte (data
direction IO-Link master
fieldbus coupler/controller).
The control byte is used to switch between register communication (see appendix,
section "Register Communication" and mailbox communication (see section
"Mailbox").
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 and IO-Link ports is
displayed cyclically via the status byte.
Control byte
Table 13: Control byte
Control byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
res.*
res.* res.* res.* res.* res.* res.*
1
0 = Read register
1 = Write register
Register number
* reserved
Status byte
Table 14: Status byte
Status byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0 GEN_
ERR
PORT4_
ERR
PORT3_
ERR
PORT2_
ERR
PORT1_
ERR
IOLM_
ERR
INT_
ERR
1 Res.
Register
number
0 Mailbox
active
(Bit 7)
1
Register communication active
0 No
error
GEN_ERR
1
Error is pending. Set when one of the bits 0…5 = 1.
0
The device attached to port 4 is not in the fault condition.
PORT4_ERR
1
The device attached to port 4 is in the fault condition.
0
The device attached to port 3 is not in the fault condition.
PORT3_ERR
1
The device attached to port 3 is in the fault condition.
0
The device attached to port 2 is not in the fault condition.
PORT2_ERR
1
The device attached to port 2 is in the fault condition.
0
The device attached to port 1 is not in the fault condition.
PORT1_ERR
1
The device attached to port 1 is in the fault condition.
0
The IO-Link master is not in the fault condition.
IOLM_ERR
1
The IO-Link master is in the fault condition.
0
No internal errors
INT_ERR
1
Internal error. Possible causes:
• 24V field supply missing
• Communication via mailbox and process data faulty.