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WAGO-I/O-SYSTEM 750
750-451 8 AI RTD
4.3.14
Resistance Measurement 1, 0 Ohm ... 5.0 kOhm, ID 14
No short-circuit detection for resistance measurements!
For sensor types "Resistance measurement 1" and "Resistance measurement 2",
short-circuit detection is not technically possible.
4.3.14.1
Default Format
With the setting "Resistance measurement 1" (0 Ohm to 5.0 kOhm), the I/O
module outputs the measured resistance values of the sensors directly.
The resistance values are displayed at a resolution of 1 digit per 0.2 Ω in one
word (16-bit). The maximum number range viewable in one word in two's
complement representation ranges from −32768 to +32767. The number range
used depends on the sensor type set and the resolution of the process value. For
the setting "Resistance measurement 1", the possible numerical range
corresponds to the defined measuring range of 0 Ohm to 5.0 kOhm and ranges
from 0 to +25000 accordingly.
Table 47: ID 14, Setting "Resistance measurement 1", Standard Format
Resistance
Ω
0
100
200
300
1000
2000
3000
4000
5000
> 5000
Overrange
> 5010
Wire break
1) Temperature values below 0 °C are represented in two's complement binary.
2) When short circuit and wire break monitoring is ON (see section "Diagnostics" > „Behavior in
the Event of an Error")
3) When underrange / overrange limit is ON (see section "Diagnostics" > „Behavior in the Event of
an Error")
Numeric value
Binary
'0000.0000.0000.0000'
'0000.0001.1111.0100'
'0000.0011.1110.1000'
'0000.0101.1101.1100'
'0001.0011.1000.1000'
'0010.0111.0001.0000'
'0011.1010.1001.1000'
'0100.1110.0010.0000'
'0110.0001.1010.1000'
'0110.0001.1010.1000'
3)
'0110.0001.1010.1000'
2)
Process Image
1)
Hex.
Dec.
0x0000
0
0x01F4
500
0x03E8
1000
0x05DC
1500
0x1388
5000
0x2710
10000
0x3A98
15000
0x4E20
20000
0x61A8
25000
0x61A8
25000
0x61A8
25000
57
Status
Error
byte
LED
hex.
0x00
OFF
0x00
OFF
0x00
OFF
0x00
OFF
0x00
OFF
0x00
OFF
0x00
OFF
0x00
OFF
0x00
OFF
0x42
ON
0x62
ON
Manual
Version 1.2.0
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