Analog Input Function Overview
 
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Description
The Analog Input is a high level analog input function with four non-isolated channels. This function is used to measure and monitor the continuous process control functions.
The Analog Input function is available on these PLCs:
General Characteristics
These are the general characteristics of the Analog Input function:
Parameter
Characteristics
Type of inputs
High level Fast inputs with common point
Nature of inputs
Voltage/Current (250 Ω internally protected resistors)
Number of channels
4
Acquisition cycle time
Fast (periodic acquisition for the declared channels used)
1.3 ms + 1.3 ms x number of channels used
Default (periodic acquisition for all channels)
6.5 ms
Display resolution (pk to pk resolution)
16-bit Σ Δ
Digital filtering
1st order
Isolation
Between channels
None
Between channels and bus
1,400 Vdc
Between channels and ground
1,400 Vdc
Maximum overload authorized for inputs
Voltage inputs
±30 Vdc
Current inputs
±90 mA
NOTE: Help ensure that the inputs connected to the analog voltage and current channels are within the maximum load limit, else it will lead to the breakage of inputs.
Measurement Range
The Analog Input function has the following measurement range characteristics:
Measurement range
±10 V; ±5 V; 0…10 V; 0…5 V; 1…5 V
0...20 mA; 4...20 mA; ±20 mA
Maximum conversion value
±11.4 V
±30 mA
Conversion resolution
0.35 mV
0.92 μA
Input impedance
10 MΩ
250 Ω Internal conversion resistor
Precision of the internal conversion resistor
-
0.1% - ±15 ppm/°C
Measurement errors for standard function:
At 25 °C
0.075% of FS(1)
0.15% of FS(1)(2)
Maximum in the temperature range -25…70 °C (-13…158 °F)
0.2% of FS(1)
0.55% of FS(1)(2)
Temperature drift
15 ppm/°C
30 ppm/°C
Monotonicity
Yes
Yes
Crosstalk between channels DC and AC 50/60 Hz
>70 dB
>70 dB
Non-linearity
0.05% of FS
0.05% of FS
Repeatability @25 °C of 10 minutes stabilization time
0.005% of FS
0.007% of FS
Long term stability after 1000 hours
<0.004% of FS
<0.004% of FS
(1) FS: Full Scale
(2) With conversion resistor error
NOTE: If nothing is connected to an Analog Input function and if the channel is configured (range 4…20 mA or 1…5 V), an I/O error is detected in the form of broken wire.