Siemens Simatic S7 Series System Manual

Communication
8.6 RS485
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
403
The CM01 signal board is RS485-compatible. The following table shows the connector that
provides the physical connection for the signal board and describes the pin assignments.
Table 8- 18 Pin assignments for the S7-200 SMART CM01 Signal Board (SB) port (Port 1)
Pin number
Connector
Signal
CM01 Signal Board (SB) port (Port 1)
1
Ground
Chassis ground
2 Tx/B RS232-Tx/RS485-B
3 Request-to-
Send
RTS (TTL)
4
M-ground
Logic common
5
Rx/A
RS232-Rx/RS485-A
6 +5 V DC +5 V, 100 Ω series resistor
8.6.4.6
Biasing and terminating the network cable
Siemens provides two types of network connectors that you can use to easily connect
multiple devices to a network:
● Standard network connector
● Connector that includes a port which allows you to connect an HMI device to the network
without disturbing any existing network connections
The programming port connector passes all signals (including the power pins) from the
S7-200 SMART CPU through to the programming port, which is especially useful for
connecting devices that draw power from the S7-200 SMART CPU (such as a TD 400C).

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.