Terminals
Signal
Meaning
1.9, 2.9, 3.9, 4.9
ZP
Central process earth
1.4 … 1.7, 2.1, 2.3 … 2.7,
3.4 … 3.7, 4.1, 4.3 … 4.7
Free
Not used
NOTICE!
The process voltage must be included in the earthing concept of the control system (e.g., earthing the
minus pole).
NOTICE!
The minus poles of the analog inputs are electrically connected to each other. They form an "Analog
Ground" signal for the module.
Because of their common reference potential, analog current inputs cannot be circuited in series, nei-
ther within the module nor with channels of other modules.
NOTICE!
There is no electrical isolation between the analog circuitry and ZP/UP. Therefore, analog sensors
must be electrically isolated in order to avoid loops via the earth potential or supply voltage.
NOTICE!
Analog signals are always laid in shielded cables. The cable shields are earthed at both ends of the
cables. In order to avoid unacceptable potential differences between different parts of the installation,
low resistance equipotential bonding conductors must be laid.
For simple applications (low disturbances, no high requirement on precision), the shielding can also be
omitted.
Examples of connections
Examples of electrical connections with AI581-S module and single channels Ix.
AC500-S Safety Modules
AI581-S analog safety input module > Mounting, dimensions and electrical connection
30.03.2017
AC500-S
142
