
23/89 Device handbook A
PLUS
with / without LED display
,
157
679-19, 04/2016
5.8 Digital inputs and outputs
For the digital inputs / outputs an external power supply of 12 / 24V DC is required.
The power supply shall not exceed 30V DC !
The plug-in terminal X7 is available for device versions with I/O
extension PCB only.
The number of digital inputs / outputs varies depending on the
optional built-in PCB, see nameplate. The operating direction of
the digital I/Os on X7 may be individually selected by means of
the PC software.
The assignment of the connections depends on
whether an I/O is configured to be a digital input or a
digital output.
Example
Device with I/O extension 2 (2 6 digital I/Os)
The digital I/Os on
plug-in terminal X7
are individually
programmable as input or output .
On
plug-in terminal X3
a digital input and a digital output are
provided statically. Their operating direction may not be
modified.
Usage as digital input
► Meter tariff switching
► Operating feedback of loads for operating time counters
► Trigger and release signal for logic module
► Pulse input for meters of any kind of energy
► Clock synchronization
► Synchronization of billing intervals in accordance with energy provider
Technical data
Input current
< 7,0 mA
Counting frequency (S0)
≤ 16 Hz
Logical ZERO
- 3 up to + 5 V
Logical ONE
8 up to 30 V