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WAGO-I/O-SYSTEM 750
750-451 8 AI RTD
4.3.13
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.
4.3.13.1
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 42: ID 14, Setting "Resistance measurement 1", Standard Format
Resistance
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")
Manual
Version 1.1.0
Ω
Binary
0
'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)
1)
Numeric value
Hex.
0x0000
0x01F4
0x03E8
0x05DC
0x1388
0x2710
0x3A98
0x4E20
0x61A8
0x61A8
0x61A8
Process Image
Status
Error
byte
hex.
Dec.
0
0x00
500
0x00
1000
0x00
1500
0x00
5000
0x00
10000
0x00
15000
0x00
20000
0x00
25000
0x00
25000
0x42
25000
0x62
51
LED
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
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