Siemens SIMATIC S7-300 Module data Reference Manual

RS 485 Repeater
7-7
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Block diagram of the RS 485 repeater
• Bus segment 1 and bus segment 2 are galvanically isolated from each other.
• Bus segment 2 and the PG/OP socket are galvanically isolated from each
other.
• Signals are amplified
– between bus segment 1 and bus segment 2
– between PG/OP socket and bus segment 2
5V
24V
Segment 2
A2
B2
A2
B2
Segment 1
A1
B1
A1
B1
PG/OP-
socket
L+ (24 V)
M
A1
B1
5 V
M5 V
L+ (24 V)
M
PE
M 5.2
Logic
5V
24V
1M1M
Figure 7-3 Block diagram of the RS 485 repeater

Siemens SIMATIC S7-300 Module data Specifications

General

Series	S7-300
Manufacturer	Siemens
Protection Class	IP20
System	SIMATIC S7-300
Digital Inputs	Varies by module
Digital Outputs	Varies by module
Analog Inputs	Varies by module
Analog Outputs	Varies by module
Central Processing Unit	Varies by CPU model
Supply Voltage	24V DC or 120/230V AC
CPU Type	Varies (e.g., CPU 312, CPU 315, etc.)
Memory	Varies by CPU model
Communication Interfaces	MPI, PROFIBUS
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Relative Humidity	10% to 95% (non-condensing)