Siemens Simatic S7 Series System Manual

Programming concepts
5.1 Guidelines for designing a PLC system
S7-200 SMART
86 System Manual, 09/2015, A5E03822230-AC
Specify the operator stations
Based on the requirements of the functional specifications, create drawings of the operator
stations. Include the following items:
● Overview showing the location of each operator station in relation to the process or
machine
● Mechanical layout of the devices, such as display, switches, and lights, for the operator
station
● Electrical drawings with the associated I/O of the CPU or expansion module
Create the configuration drawings
Based on the requirements of the functional specification, create configuration drawings of
the control equipment. Include the following items:
● Overview showing the location of each CPU in relation to the process or machine
● Mechanical layout of the CPU and expansion I/O modules (including cabinets and other
equipment)
● Electrical drawings for each CPU and expansion I/O module (including the device model
numbers, communications addresses, and I/O addresses)
Create a list of symbolic names (optional)
If you choose to use symbolic names for addressing, create a list of symbolic names for the
absolute addresses. Include not only the physical I/O signals, but also the other elements to
be used in your program.

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.