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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
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Type of interface integrated RS485 interface
Physics RS485
electrically isolated No
Interface current supply
(15 to 30 V DC)
max. 200 mA
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• MPI Yes
• PROFIBUS-DP No
• PtP communication No
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Services
• PG/OP communication Yes
• Routing No
• Global data communication Yes
• S7-based communication Yes
• S7 communication Yes
as server Yes
as Client Yes (via CP and loadable FBs)
• Transmission rates 187.5 Kbps
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Programming language LAD/FBD/STL
Available instructions See the Instruction List
Nesting levels 8
System functions (SFCs) See the Instruction List
System function blocks (SFBs) See the Instruction List
User program security Yes
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Mounting dimensions W x H x D (mm) 40 x 125 x 130
Weight 280 g
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Power supply (nominal value) 24 VDC
• Permitted range 20.4 V to 28.8 V
Current consumption (no-load operation) normally 60 mA
Inrush current normally 2.5 A
Power consumption (nominal value) 0.6A
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2
t 0.5 A
2
s
External fusing of power supply lines
(recommended)
min. 2 A
Power loss typically 2.5 W
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