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11 Annex
11.1.4 Digital inputs/outputs
11.1.5 Relays
Number Max. 12 (see connection diagram)
Input or output Individually configurable as input or output
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 (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
Output
Output signal DC 0/24 V +10/-15 %; galvanically isolated
Current Max. 40 mA per output, max. 100 mA in total (including auxiliary voltage supply
current)
Auxiliary voltage supply
Voltage DC 24 V +10/-15 %
Current Max. 100 mA (including digital outputs current)
Number 1 (see connection diagram)
Relay (changeover contact)
Switching capacity 3 A at AC 230 V or DC 30 V, resistive load
Contact life 30,000 switching operations at rated load
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