Siemens Simatic S7 Series System Manual

Communication
8.6 RS485
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
399
8.6.3
Sample RS485 network configurations
8.6.3.1
Single-master PPI networks
Introduction
The following network configurations are possible using only S7-200 SMART devices:
● Single-master PPI networks
● Multi-master and multi-slave PPI networks
● Complex PPI networks
Single-master PPI networks
In the sample network in the figure below, a human-machine interface (HMI) device (for
example, a TD400C, TP, or KP) is the network master:
In the sample network, the CPU is a slave that responds to requests from the master.
8.6.3.2
Multi-master and multi-slave PPI networks
The following figure shows a sample network of multiple masters with one slave. The HMI
devices share the network.
The HMI devices are masters and must have separate network addresses. The
S7-200 SMART CPU is a slave.

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.