Analog Input Modules; Principles - VIPA System 300S Manual

Analog Input Modules

Principles

3 Analog Input Modules
3.1 Principles
Cables for analog sig-
nals
Connecting test probes
Parameterization
Diagnostic functions
26
For analog signals you have to use isolated cables to reduce interfer-
ence. The cable screening should be grounded at both ends. If there
are differences in the potential between the cable ends, there may
occur a potential compensating current that could disturb the analog
signals. In this case you should ground the cable screening only at
one end.
The analog input modules provide variant connecting possibilities for:
n Current sensor
n Voltage senor
n Resistance thermometer
n Thermocouple
n Resistors
Please take care of the correct polarity when installing
the measuring transducer! Please install short circuits
at non-used inputs by connecting the positive contact
with the channel ground of the according channel.
The analog input modules from VIPA do not have any measuring
range plug. The modules are parameterized via the hardware config-
urator or during runtime via SFCs.
The modules that are described in this chapter except the 331-1KF01
offer diagnostics functions. The following errors may cause diagnos-
tics:
n Error in the project engineering res. parameterization
n Wire break at current measuring
n Measuring range overstep
n Measuring range shortfall
n Common Mode Error
n Lost process interrupt
n Failure of the external power supply
For diagnostic evaluation during runtime, you may use the SFCs 51
and 59. They allow you to request detailed diagnostic information and
to react to it.
VIPA System 300S
HB140 | SM-AIO | | GB | Rev. 16-39