Kipp&Zonen COMBILOG Data Logger - Manual (Page 30)

As inputs the I/Os can be used for collecting feed-back signals,
for measuring frequencies, as counters or for receiving special
serial 8-bit-Graycode signals. Status information can be issued
by the outputs. Thereby host-controlled or process-controlled
status outputs are possible.
The digital inputs have an excess voltage protection (transil di-
odes), with nominal threshold 30 V. Input voltages between
2.0 VDC and 30 DC are interpreted as logic LOW ("0"), input
voltages lower than 0.9 V as logic HIGH ("1"). The maximum
input current is 1.5 mA.
Figure 4.1 Definition of signal levels and logic levels
The outputs are open-collector type with a maximum voltage of
30 VDC and a maximum current of 100 mA.
4.3 Power Switch
The data logger Combilog 1022 has two power switches which
act as voltage supplies for external sensors.
A power switch can be assigned to an analogue channel and
configured with a lead time (see chapter Power Switch ).
The supply is switch on with a configurable time before the se-
lected analogue input channel will be measured.
Hardware Manual COMBILOG 1022 30
Signal level Logical level