ABB AC500 PLC - Connection of Passive-type Analog Sensors (Current) and Series-Connection of an Additional Analog Sensor; Connection of Digital Signal Sources at Analog Inputs

Connection of Passive-type Analog Sensors (Current) and Series-Connection of an Additional Analog
Sensor
ZP
1.0
I0-
1.1
I0B
1.8
UP
1.9
ZP
PTC
2.0
I0+
2.1
I0A
2.8
UP
2.9
ZP
+4 ... +20 mA
-
+
UP
+
-
1
Fig. 49: Connection example
1 Analog input of the second device
If series-connection of an additional input is used, the input resistance of the
module (ca. 330 Ω) must be added to the input resistance of the second device.
Make sure that the maximum permitted load resistance of the analog sensor is
not exceeded (see the data sheet of the analog sensor).
The input of the module is not related to ZP. If the input of the second device is
related to ZP, the order of sequence in the series-connection must be observed
by all means (from the sensor to the module and then to the input of the second
device).
The following measuring ranges can be configured Ä Chapter 1.5.2.2.2.6 “Parameterization”
on page 489:
Current -20 mA...20 mA *) 1 channel used
Current 0 mA...20 mA *) 1 channel used
Current 4 mA...20 mA 1 channel used
*) This setting is not applicable with passive-type analog sensors (current).
The function of the LEDs is described under Diagnosis and displays / displays Ä Chapter
1.5.2.2.2.7 “Diagnosis” on page 493.
Unused input channels can be left open, because they are of low resistance.
Connection of Digital Signal Sources at Analog Inputs
Several (or all) analog inputs can be configured as digital inputs. The inputs are not electrically
isolated against the other analog channels.
Device Specifications
I/O Modules > Analog I/O Modules
2019/04/17 3ADR010121, 13, en_US 481