Siemens SIMATIC S7-300 Module data Reference Manual

Power Supply Modules
2-5
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Basic circuit diagram of the PS 305; 2 A
L+2
M2
L+1
M1
24 VDC
I/
U
Figure 2-2 Basic Circuit Diagram of the PS 305 Power Supply Module (2 A)
Line protection
We recommend that you install a miniature circuit-breaker (MCB) (for example
Siemens 5SN1 series) with the following rating to protect the incoming supply
cable of the PS 305 power supply module (2 A):
• Rated current at 110 VDC: 10 A
• Tripping characteristic (type): C.
Reaction to atypical operating conditions
Table 2-1 Reaction of the PS 305 Power Supply Module (2 A) to Atypical Operating
Conditions
If ... ... Then ... 24 VDC
LED
... the output circuit is overloaded:
• I > 3.9 A (dynamic)
• 3 A < I v 3.9 A (static)
Voltage dip, autom. volt. recovery
Voltage drop, shortening of service life
Flashes
... the output is short-circuited Output voltage 0 V; automatic voltage
recovery after short circuit has been
eliminated
Dark
An overvoltage occurs on the primary side Possible destruction -
There is an undervoltage on the primary
side
Automatic disconnection; automatic voltage
recovery
Dark

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)