Process Data - WAGO 750-643 Manual

Differentiation is made between two types of MP-Bus communication. One
type of communication is used purely for sending broadcast messages, and the
other type controls and monitors the communication using a request-response
process. As the command that has been sent is not contained in the response to
a telegram from an MP-Bus device, the module makes two different request-
response processes available. In the advanced process (MSG_CODE
K2F_COM_T2), the MP-Bus command sent is returned by the module in the
module bus response. This makes it easier for the function block to monitor
and assign the response.

2.1.1.7 Process data

The bus module 750-643 makes an 8-byte process image available to the
fieldbus controller via 1 logical channel. The data to be sent and received are
stored in 6 output bytes (D0 ...D5) and 6 input bytes (D0 ...D5). Two control
bytes (C0, C1) and two status bytes (S0, S1) are used to control the data flow.
The bytes C1 and S1 are transferred as data bytes but are used as extended
status and control bytes.
S0
S1
D0
D1
D2
D3
D4
D5
RXD
TXD
X24V
XMASTER
DPID
GENERR
REG
0
WAGO-I/O-SYSTEM 750
I/O Modules
Input data
Status byte
Extended status byte
Data byte 0
Data byte 1
Data byte 2
Data byte 3
Data byte 4
Data byte 5
Bit 7 Bit 6 Bit 5
REG GEN
ERR
A receive action has been executed within the last 30 seconds.
A transmit action has been executed within the last 30 seconds.
0 = External supply voltage detected / 1 = Supply missing.
External MP-Bus master detected.
Partial packet ID, 0 = first partial packet, 1 = second partial packet.
General module error (e.g. flash checksum error).
0 = Process data exchange / 1 = Register communication.
not used
750-643 [MP-Bus Master Module]
C0
C1
D0
D1
D2
D3
D4
D5
Status byte (S0)
Bit 4 Bit 3
0 DPID XMAST
ER
Process data
Output data
Control byte
Extended control byte
Data byte 0
Data byte 1
Data byte 2
Data byte 3
Data byte 4
Data byte 5
Bit 2 Bit 1
X24V TXD
• 15
Bit 0
RXD