Siemens SIMATIC S7 EIP-200S System Manual page 96

General technical specifications
5.2 Standards Compliance
Degree of protection
● IP20 Mechanical Protection, EN 60529
● Protects against finger contact with high voltage as tested by standard probe. External
protection required for dust, dirt, water and foreign objects of < 12.5mm in diameter.
Rated voltages
Table 5- 7
Rated voltage
24 VDC
Note
When a mechanical contact turns on output power to the ET 200S or to any digital signal
module, it sends a "1" signal to the digital outputs for approximately 50 microseconds. This
could cause unexpected machine or process operation which could result in death or serious
injury to personnel and/or damage to equipment. You must plan for this, especially if you are
using devices which respond to short duration pulses.
Reverse voltage protection
Reverse voltage protection circuitry is provided on each terminal pair of +24 VDC power or
user input power for CPUs, signal modules (SMs), and signal boards (SBs). It is still possible
to damage the system by wiring different terminal pairs in opposite polarities.
Some of the 24 VDC power input ports in the ET 200S distributed I/O system are
interconnected, with a common logic circuit connecting multiple M terminals. For example,
the following circuits are interconnected when designated as "not isolated" in the data
sheets: the 24 VDC power supply of the CPU, the power input for the relay coil of an SM, or
the power supply for a non-isolated analog input. All non-isolated M terminals must connect
to the same external reference potential.
Connecting non-isolated M terminals
Connecting non-isolated M terminals to different reference potentials will cause unintended
current flows that may cause damage or unpredictable operation in the PLC and any
connected equipment.
Failure to comply with these guidelines could cause damage or unpredictable operation
which could result in death or serve personal injury and/or property damage.
Always ensure that all non-isolated M terminals in an ET 200S distributed I/O system are
connected to the same reference potential.
96
Rated voltages
Tolerance
20.4 VDC to 28.8 VDC
WARNING
EIP-200S Ethernet/IP Adapter Distributed I/O System
System Manual, 06/2018, A5E44345053-AB