6 Annex
78
6.1.2 Digital inputs
6.1.3 Analog outputs
Number Max. 18 (see connection diagram)
Input
Level Logic level 0: < 3.5 V; logic level 1: > 10 V
Sampling rate 125 ms (max. counting frequency: 4 Hz)
Potential-free contact R
ON
: < 1kΩ; R
OFF
: > 50 kΩ (use of auxiliary voltage 24 V)
High-speed input
Usable inputs 1, 2, 7, 8, 13, 14 (only for analog(HI)/digital option, see connection diagram)
Function Counts each positive edge of the input signal
Max. counting frequency 12.5 kHz
Mark-to-space ratio 30 to 70 % (high-pulse ≥ 30 μs, low-pulse ≥ 30 μs)
Accuracy for
flow measurement
0.5 % of measured value; ambient temperature influence: 50 ppm/K
Auxiliary voltage supply
Voltage DC 24 V +10/-15 %
Current Max. 50 mA per slot (for analog (HI)/digital option: incl. digital output currents)
Number Max. 3 (see connection diagram)
Voltage
Output signal DC 0 to 10 V
Load resistance > 500 Ω
Current
Output signal DC 0(4) to 20 mA
Load resistance < 450 Ω
Accuracy 0.5 %
Ambient temperature influence 150 ppm/K
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