38 Process Image
WAGO-I/O-SYSTEM 750 XTR
750-404/040-003 Counter Adjust XTR
Manual
Version 1.1.0
Status Byte
B7 B6
B5
B4
B3
B2
B1
B0
X
X
ST_
GATE
T
VD
ACK
Output
“DO 2”
status
Output
“DO 1”
status
RANGE_SEL
ACK1
RANGE_SEL
ACK0
ST_GATE
Input “U/D” status (0 = enabled, 1 = disabled)
T
vd
ACK
Confirmation of change in T
VD
.
RANGE_SEL ACK1
Confirmation of range selection, frequency values are valid.
RANGE_SEL ACK0
Confirmation of range selection, frequency values are valid.
X
This value is not evaluated.
The following functions can be executed:
Setting Measurement Method, Frequency Range and Measured Value
Display:
The “RANGE_SEL REQ” bits in the control byte are used to set the measurement
methods and display of the frequency value. The maximum frequency value also
changes depending on the measuring method set. The following table shows the
different operating modes
RANGE_
SEL1
RANGE_
SEL0
Measuring
Method
*)
Maximum
Frequency Range
Measured
Value
Display
0
0
1 period
0.1 Hz … 8 kHz
Frequency in
1/1000 Hz
0
1
4 periods
0.25 Hz … 32 kHz Frequency in
1/100 Hz
1
0
16 periods
1 Hz … 100 kHz
Frequency in
1/10 Hz
1
1
16 periods
1 Hz … 100 kHz
Frequency in
Hz
*)
integration via…
Taking Delay Time into Account
When setting a new frequency range, there is a delay time until valid data is
read. After acknowledging the new frequency range settings via the
“RANGE_SEL ACK” bits, this delay time must be taken into account.
The following formula can be used to calculate the maximum delay time:
T
Dmax
= 2 × Number of periods that are integrated
Current frequency value
If “GATE” is enabled, the input data receives the last valid frequency value. No
new range can be requested in this status.