Connector / Terminal
Pin
Assignment / Signal
X6 / 4.7
33
AI523 / I15+
X6 / 4.6
34
AI523 / I14+
X6 / NC
35
Not connected
X6 / NC
36
Not connected
In module AI523, the signals I8-, I10-, I12- and I14- are internally connected to an analog earth.
The potential difference of the analog earth to M is
±
1 V (max.). The replacement device does
not have current sources on pins 35 and 36. If necessary, these current sources can be con-
nected to individual measurement channels via the configuration (DIP switch).
CAUTION!
System damage caused by voltage!
The exchange of a replacement device under voltage can cause permanent
system damage (destruction).
Fig. 59: Differential voltage input
1) Electrically isolated power supply of analog sensor
2) Earthing at sensor
±
10 V or
±
5 V at differential inputs
On the replacement devices, the wire-break detection is also active in case of a differential
voltage measurement. For this purpose, each measuring channel is internally pulled to "plus" by
means of a high-impedance resistor. As a result, the individual potentials of the differential
voltage measurement must also be referenced to M. Completely isolated voltages are
not
sym-
metrized to M by the inputs.
The potential difference of the earthing at the sensor to M must not be too big
(max.
±
1 V for the whole signal range). Otherwise problems can occur con-
cerning the common-mode input voltages of the involved analog inputs.
AC31 Adapters
Replacement devices: I/O modules > Replacement device 07AI91-AD
2018/09/24
3ADR010122, 8, en_US
93
