WAGO-I/O-SYSTEM 750 XTR
Process Image 37
750-404/040-003 Counter Adjust XTR
Manual
Version 1.1.0
Figure 8: Time Diagram: Process Data Update Sequence (integration time = 4 periods)
In this operating mode, the 750-404/040-003 I/O module provides the fieldbus
coupler/controller with 5-byte in- and output process images via two logical
channels.
The watchdog time to be set is stored in binary format in the two output bytes
(D0, D1). The output bytes (D2, D3) are not used.
The frequency value is stored in binary format in the four input bits (D0 … D3).
Control byte C0 is used to generate the integration time, the watchdog time and
the measured value display, as well as to set the outputs. Status byte S0
contains the confirmation of the settings and the statuses of the inputs and
outputs.
Table 26: Overview of Input and Output Data
Input Data
Output Data
S0
Status byte
C0
Control byte
D0
Frequency value byte 0 (LSB) D0
Watchdog time byte 0 (LSB)
D1
Frequency value byte 1
D1
Watchdog time byte 1 (MSB)
D2
Frequency value byte 2
D2
Reserved
D3
Frequency value byte 3 (MSB) D3
Reserved
Control Byte
B7 B6
B5
B4
B3
B2
B1
B0
0
0
0
T
VD
REQ
Set
output
“DO 2”
Set
output
“DO 1”
RANGE_SEL
REQ1
RANGE_SE
L REQ0
T
VD
REQ
Request to change the watchdog time (TVD) with valid data.
RANGE_SEL REQ1
Selection of the integration time and display of the measured
frequency values.
RANGE_SEL REQ0
Selection of the integration time and display of the measured
frequency values.
0
These constants must be set to 0.