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9 Appendix
Standard signals
Measuring circuit monitoring
In the event of an error the digitized output values move to a defined status.
9.1.2 Digital input
Designation Measuring range Measuring accu-
racy
1
Ambient
temperature influ-
ence
Voltage ≤ 0.05 % 100 ppm/K
Input resistance R
E
>500kΩ DC 0(2) to 10 V
Input resistance R
E
>100kΩ DC0to1V
Current (voltage drop ≤ 2V) DC0(4)to20mA ≤ 0.05 % 100 ppm/K
Resistance transmitter min. 100 Ω,
max. 4 kΩ
± 4 Ω 100 ppm/K
Resistance/potentiometer < 400 Ω
400 Ω to 4 kΩ
± 0.4 Ω
± 4 Ω
50 ppm/K
50 ppm/K
1
The accuracy values refer to the maximum measuring range. Smaller measuring ranges lead to reduced lineariza-
tion accuracy.
Measuring element Out of range Probe/cable short
circuit
Probe/cable break
Thermocouple Is detected Is not detected Is detected
RTD temperature probe Is detected Is detected Is detected
Voltage
2 to 10 V Is detected Is detected Is detected
0 to 10 V Is detected Is not detected Is not detected
0 to 1 V Is detected Is not detected Is not detected
Current
4 to 20 mA Is detected Is detected Is detected
0 to 20 mA Is detected Is not detected Is not detected
Resistance transmitter Is detected Is not detected Is detected
Resistance/potentiometer Is detected Is detected Is detected
Number 1
Input signal DC 0/24 V
(PLC level; logical “0” = -3 to +5 V; logical “1” = +15 to +30 V)
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