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6ES7901-3CB30-0XA0

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Connecting a serial PC to an S7-200 PPI network, Siemens 6ES7901-3CB30-0XA0 is a 5 m RS-232/PPI Multi-Master programming cable with an isolated converter.
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Technical specifications for 6ES7901-3CB30-0XA0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7901-3CB30-0XA0
  • Product Family:
    Siemens Simatic S7-200
  • Product Type:
    SIMATIC S7-200 RS-232/PPI Multi-Master Cable
  • Stock:
    1
  • Cable Function:
    RS-232 to PPI/RS-485 Multi-Master interface
  • Cable Length:
    5 m
  • PC Interface:
    RS-232 serial port
  • PLC Interface:
    PPI/RS-485
  • Supply Range:
    14.4-28.8 V DC
  • Supply Current:
    60 mA RMS maximum at 24 V
  • Galvanic Isolation:
    500 V DC between RS-485 and RS-232
  • RS-485 Common Mode:
    -7 to +12 V for 1 second; 3 V RMS continuous
  • Receiver Impedance:
    5.4 kOhm minimum including termination
  • Receiver Threshold:
    +/-0.2 V with 60 mV typical hysteresis
  • Bias to +5 V:
    10 kOhm on B, PROFIBUS pin 3
  • Bias to Ground:
    10 kOhm on A, PROFIBUS pin 8
  • Transmitter Output:
    2 V minimum at 100 Ohm; 1.5 V minimum at 54 Ohm
  • Parameter Setting:
    Adapter DIP switches
  • Tariff Code:
    85444290
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Serial Path Adapter Power Line Biasing Switch Setup

Features:

  • An integral converter bridges the PC RS-232 interface and the differential PPI/RS-485 network side.
  • Galvanic isolation separates the two communication interfaces within the cable adapter.
  • Adapter switch settings align the cable operating parameters with the controller and PC connection.
Siemens 6ES7901-3CB30-0XA0 provides the physical programming path for an S7-200 connection from a computer equipped with a serial port.

Power for the converter arrives from the controller side, so a correctly wired PLC port is part of establishing the link.

The cable assembly incorporates RS-485 biasing and receiver termination instead of leaving those functions to a separate inline device.

The Siemens 6ES7901-3CB30-0XA0 SIMATIC S7-200 RS-232/PPI Multi-Master Cable may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES7901-3CB30-0XA0 SIMATIC S7-200 RS-232/PPI Multi-Master Cable Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Tracing data across the two cable interfaces

  • PC Side: The computer communicates through a physical RS-232 serial interface.
  • Converter Stage: The inline adapter changes the electrical signalling between RS-232 and RS-485.
  • Controller Side: The PPI connector joins the RS-485 port of the S7-200 network.
  • Bidirectional Link: Programming requests and controller responses follow the same converted cable path.

Supplying the inline electronics from the PLC connection

  • Source: The controller-side connector provides the DC supply used by the converter.
  • Isolation Barrier: The powered RS-485 side remains galvanically isolated from the PC RS-232 side.
  • Current Demand: The adapter load is included when checking the available port supply.
  • Link Symptom: A cable with no controller-side power cannot establish the conversion path even when the PC port is active.

Holding the differential receiver at a defined idle state

  • B Conductor: A resistor biases the B line toward the internal 5 V reference.
  • A Conductor: A matching resistor biases the A line toward the interface ground.
  • Receiver Load: The integrated termination contributes to the minimum input impedance seen by the RS-485 network.
  • Differential Decision: The receiver uses the voltage difference between A and B rather than either conductor alone.

Matching the adapter to the intended communication session

  • Mode Selection: The adapter switch bank selects the supported operating mode for the cable.
  • Network Rate: The chosen setting must correspond with the PPI baud rate configured at the controller.
  • PC Parameters: The serial communication parameters at the computer remain consistent with the cable mode.
  • Commissioning Check: Switch positions are verified before diagnosing software or network addressing.
Description
The Siemens 6ES7901-3CB30-0XA0 is a SIMATIC S7-200 RS-232/PPI Multi-Master cable. It connects the serial interface of a configuration PC to the PPI/RS-485 port of the controller so project transfer and bus communication pass through the converter in the cable.

Inside the adapter housing, 6ES7901-3CB30-0XA0 translates the single-ended RS-232 signals to the differential RS-485 pair used by PPI. Galvanic isolation separates the two interface sides, while the PLC-side connection supplies the converter within its specified DC range.

Communication behavior for 6ES7901-3CB30-0XA0 is selected at the adapter rather than inferred from the connector alone. The switch positions define the applicable operating parameters, so the cable settings, PC serial parameters, and controller network rate must agree before a link is established.

The five-metre construction of 6ES7901-3CB30-0XA0 keeps the PC connection and the PPI connector as one assembly. The integral bias and termination network establishes the defined idle conditions on the RS-485 receiver side without adding a separate converter between the cable ends.
Alternative Names
6ES79013CB300XA0 6ES7 901-3CB30-0XA0 6ES7 901 3CB30 0XA0 Siemens 6ES7901 3CB30 0XA0 SIMATIC 6ES7901-3CB30-0XA0 6ES7901-3CB30-0XA0 RS232 PPI Cable 6ES79O1-3CB3O-OXAO 6ES790I-3CB30-0XA0
Technical notes
Siemens 6ES7901-3CB30-0XA0 converts a PC RS-232 connection to the S7-200 PPI/RS-485 bus. Confirm the serial port and adapter switch settings before communication tests.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why will Siemens 6ES7901-3CB30-0XA0 not work from a computer that has only USB ports?
Siemens 6ES7901-3CB30-0XA0 presents an RS-232 PC interface, so the computer must provide a suitable serial port or an independently verified serial interface.
Where does Siemens 6ES7901-3CB30-0XA0 obtain power for its converter?
The converter electronics in Siemens 6ES7901-3CB30-0XA0 are supplied from the controller-side connection within the documented 14.4-28.8 V DC range.
Which settings should be compared when Siemens 6ES7901-3CB30-0XA0 cannot establish PPI communication?
For Siemens 6ES7901-3CB30-0XA0, compare the adapter DIP switches, PC serial parameters, controller address, and PPI network rate before changing the cable.
Does Siemens 6ES7901-3CB30-0XA0 directly join the PC ground to the RS-485 network?
No. Siemens 6ES7901-3CB30-0XA0 provides a 500 V DC galvanic-isolation barrier between its RS-232 and RS-485 sides.
How can Siemens 6ES7901-3CB30-0XA0 be distinguished from the USB/PPI cable?
Siemens 6ES7901-3CB30-0XA0 is the RS-232/PPI Multi-Master article and uses the serial PC interface; the USB/PPI cable has a different order number and PC connector.
What cable length should be allowed when routing Siemens 6ES7901-3CB30-0XA0?
Siemens 6ES7901-3CB30-0XA0 is a 5 m assembly, so routing must accommodate the fixed cable and inline adapter without stressing either connector.