Siemens Simatic S7 Series System Manual

Installation
3.2 Power budget
S7-200 SMART
40 System Manual, 09/2015, A5E03822230-AC
for a non-isolated analog input. All non-isolated M terminals must connect to the same
external reference potential.
WARNING
Avoiding unwanted current flow
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 S7-200 SMART system are
connected to the same reference potential.
Refer to the technical specifications for your particular CPU to determine the 24 V DC sensor
supply power budget, the 5 V DC logic budget supplied by your CPU and the 5 V DC power
requirements of the expansion modules and signal boards.

Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.