Siemens M7-400 ユーザーズマニュアル

5-45

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

The non-isolated sensors are connected with the local ground potential (local
ground). When using non-isolated sensors, you must connect M

ANA

 to chassis

ground.

Caused by local conditions or interference, potential differences U

CM

 (static or

dynamic) can occur between the locally distributed individual measuring points. If
the potential difference U

CM

 exceeds the permissible value, you must provide

equipotential bonding conductors between the measuring points.

M+

M–

U

ISO

M+
M–

M

ANA

Chassis ground

Non-isolated
sensors

U

CM

Equipotential
bonding conductor

Figure 5-8

Connecting Non-Isolated Sensors to an Isolated AI

Do not use non-isolated two-wire transmitters and non-isolated resistance sensors!