1.0
1.1
1.8
1.9
AI0+
AI1+
UP
ZP
UP
ZP
PTC
1.5
AI–
1
4...20 mA
–
+
Fig. 128: Connection of passive-type analog sensors (current)
1
1 analog sensor requires 1 channel
Current
4...20 mA
1 channel used
The measuring ranges are described in the section Measuring Ranges
“Parameterization” on page 694
Chapter 1.7.3.1.10 “Measuring ranges” on page 703
.
CAUTION!
If, during initialization, an analog current sensor supplies more than 25 mA
for more than 1 second into an analog input, this input is switched off by the
module (input protection). In such cases, it is recommended, to protect the
analog input by a 10-volt zener diode (in parallel to I+ and I-). But, in general,
it is a better solution to prefer sensors with fast initialization or without current
peaks higher than 25 mA.
Unused input channels can be left open-circuited, because they are of low resistance.
Connection of active-type analog sensors (Voltage) to differential inputs
Differential inputs are very useful, if analog sensors are used which are remotely non-isolated
(e.g. the minus terminal is remotely grounded).
The evaluation using differential inputs helps to considerably increase the measuring accuracy
and to avoid ground loops.
With differential input configurations, two adjacent analog channels belong together (e.g. the
channels 0 and 1). In this case, both channels are configured according to the desired operating
mode. The lower address must be the even address (channel 0), the next higher address must
be the odd address (channel 1). The converted analog value is available at the higher address
(channel 1).
The analog value is calculated by subtraction of the input value with the higher address from the
input value of the lower address.
The converted analog value is available at the odd channel (higher address).
Device specifications
Communication interface modules (S500) > EtherCAT
2022/01/31
3ADR010278, 3, en_US
689
