Wiring Analog Inputs With Mana Connection - Siemens SIMATIC ET 200AL System Manual

4.2

Wiring analog inputs with MANA connection

The reference potentials of the measuring inputs and the central ground are electrically
isolated in analog input modules with M
Limited potential difference U
Always verify that the admissible potential difference U
analog ground M
Potential difference U
If you want to ensure that the permitted value U
bonding cable between the terminal M
Limited potential difference U
Always verify that the admissible potential difference U
measuring inputs and the analog groundM
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 maximum value U
reference points of the measuring inputs and the analog ground M
bonding cable.
Analog value processing
Function Manual, 06/2014, A5E03461439-AC
(insulation voltage)
ISO
and the central ground is not exceeded.
ANA
may be caused by: Maximum line lengths exceeded.
ISO
(common mode)
CM
may be caused by:
CM
4.2 Wiring analog inputs with MANA connection
connection.
ANA
between the reference point of the
ISO
is not exceeded, install an equipotential
ISO
and the central grounding point.
ANA
between the reference point of the
CM
is not exceeded.
ANA
CM
is not exceeded, interconnect the
CM
Connecting transducers
CM
and report this error with an
with an equipotential
ANA
is
67