Wiring Analog Inputs Without Mana Connection - Siemens SIMATIC ET 200AL System Manual

4.3

Wiring analog inputs without MANA connection

The reference potentials of the measuring inputs and the central ground are electrically
isolated from each other in analog input modules without an M
Limited potential difference U
Always verify that the maximum potential difference U
measuring inputs and central ground is not exceeded.
Potential difference U
If you want to ensure that the permitted value U
bonding cable between the reference points of the measuring inputs and the central
grounding point.
Limited potential difference U
Always ensure that the permitted potential difference U
the measuring inputs is not exceeded.
Potential differences U
● Environments with EMC disturbance
● Use of grounded transducers
● Use of long cable lengths
Measuring errors / malfunctions can occur if the admissible potential difference U
exceeded.
Some modules can detect an invalid potential difference U
entry in the diagnostics buffer of the CPU.
If you want to ensure that the permitted value U
bonding cables between the reference points of the measuring inputs or, with the
ET 200eco PN and ET 200pro, between the reference points of the measuring inputs and
ground.
Analog value processing
Function Manual, 06/2014, A5E03461439-AC
(insulation voltage)
ISO
may be caused by: Maximum line lengths exceeded.
ISO
(common mode)
CM
may be caused by:
CM
4.3 Wiring analog inputs without MANA connection
ANA
between the reference points of the
ISO
is not exceeded, install an equipotential
ISO
between the reference points of
CM
and report this error with an
CM
is not exceeded, install equipotential
CM
Connecting transducers
connection.
is
CM
69