40
Commissioning
WAGO-I/O-SYSTEM 750
750-464 2/4 AI RTD configurable
Manual
Version 1.0.1
Table 18: Register 35
Register
Function
Memory
Access
Default settings
35
User Underrange
EEPROM
R/W
0x8001
16-bit signed integer
The measured value Y5 is compared to this limit and the comparison result
entered in status byte Sx in bits 2, see Status Byte Description.
The resolution / LSB is in accordance with the respective process value.
Table 19: Register 36
Register
Function
Memory
Access
Default settings
36
User Overrange
EEPROM
R/W
0x7FFF
The measured value Y5 is compared to this limit and the comparison result
entered in status byte Sx in bits 3, see Status Byte Description.
The resolution / LSB is in accordance with the respective process value.
Table 20: Register 37
Register
Function
Memory
Access
Default settings
37
Coefficients
Mean value filter
EEPROM
R/W
0x0003
16-bit unsigned integer
Acceptable value range 2, 3 and 4.
Coefficients for the mean value filter before calculation of Y1.
Bit 7 of the Feature register can be used to switch ON/OFF mean value filtering.
Filtering is enabled immediately after determining the measured resistance value
on the sensor input. The number of measured values averaged is indicated in
register 37 and can be configured via WAGO-I/O-CHECK. Possible values are 2
and 3 (possibly 4). Mean value filtering is switched off by default (i.e. bit 7 = 0).
The default value for register 37 is 0x0003, i.e. when filtering is active, the mean
value is outoupt from the last 3 measured values.
The mean value filter is only enabled if the determined resistance value of the
sensor does not fall below or exceed the previously determined value by 24
mOhm. Otherwise, it is not averaged and the current measured value is used as
the baseline for the next (possible) filtering.
Table 21: Register 39
Register
Function
Memory
Access
Default settings
39
User calibration
Offset
EEPROM
R/W
0x0000
16-bit unsigned integer
In 2-wire mode, the measured resistance is reduced by the value specified in
register 22. The resolution is 1/256.
The calibration value is entered to eliminate the internal line or coil resistence.
