Siemens SIMATIC S7-1200 System Manual page 1366

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Table of Contents

Technical specifications

A.2 General technical specifications

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

Rated voltage

120/230 V AC

When a mechanical contact turns on output power to the S7-1200 CPU, or any digital

expansion 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 V DC 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 V DC power input ports in the S7-1200 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 V DC power

supply of the CPU, the sensor power of the CPU, the power input for the relay coil of an SM,

and 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 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 severe personal injury and/or property damage.

Always ensure that all non-isolated M terminals in an S7-1200 system are connected to the

same reference potential.

Rated voltages

20.4 V DC to 28.8 V DC

85 V AC to 264 V AC, 47 to 63 Hz

System Manual, V4.2, 09/2016, A5E02486680-AK

S7-1200 Programmable controller