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6ES7157-0AC85-0XA0

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Siemens 6ES7157-0AC85-0XA0 is an FDC 157 field device coupler that links PROFIBUS DP to PROFIBUS PA or Foundation Fieldbus while supplying segment power.
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Technical specifications for 6ES7157-0AC85-0XA0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7157-0AC85-0XA0
  • Product Family:
    Siemens Simatic DP
  • Product Type:
    FDC 157 Field Device Coupler
  • Stock:
    1
  • Rated supply:
    24 V DC
  • Supply range:
    20.4-28.8 V DC
  • Maximum input current:
    2.3 A at 24 V DC
  • Typical power loss:
    13.4 W
  • PROFIBUS DP rate:
    45.45 kbit/s
  • PROFIBUS DP connection:
    9-pin Sub-D
  • PROFIBUS PA rate:
    31.25 kbit/s
  • Connectable PA devices:
    Up to 31
  • PA output current:
    Up to 1 A
  • Power-failure buffering:
    5 ms
  • Additional fieldbus:
    Foundation Fieldbus H1
  • Diagnostic LEDs:
    DP activity, PA activity, BF, SF and 24 V ON
  • Isolation test:
    600 V DC
  • Protection degree:
    IP20
  • Operating temperature:
    -25 to 60 °C
  • Storage temperature:
    -40 to 70 °C
  • Relative humidity:
    Up to 95%
  • Redundancy:
    One module or one redundant coupler pair
  • Weight:
    1.303 lbs (0.591 kg)
  • Estimated shipping dimensions:
    13.2x15.4x8.9cm
  • Tariff Code:
    85176200
  • 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 Bus Conversion Segment Power Status Signals Isolation Limits

Features:

  • The coupler translates PROFIBUS DP communication to a PROFIBUS PA or Foundation Fieldbus H1 segment.
  • Integrated fieldbus power supplies up to 1 A for as many as 31 connected PA devices.
  • Redundancy support and separate activity, fault and supply indicators expose the state of each bus side.
The fieldbus side runs at 31.25 kbit/s, giving every attached instrument a shared communication segment and power path through the coupler.

Five milliseconds of supply-failure buffering keeps the internal electronics energized through a brief input interruption.

Potential separation is maintained among the backplane, PROFIBUS DP, PROFIBUS PA and 24 V supply circuits, with isolation tested at 600 V DC.

The Siemens 6ES7157-0AC85-0XA0 FDC 157 Field Device Coupler may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES7157-0AC85-0XA0 FDC 157 Field Device Coupler 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.

Data path between bus levels

  • DP input: The 9-pin Sub-D interface receives PROFIBUS DP telegrams at up to 45.45 kbit/s.
  • Fieldbus output: The lower-level PA or FF H1 segment communicates at 31.25 kbit/s.
  • Shared segment: Up to 31 field devices use the same downstream communication path.
  • Protocol choice: The installed bus-link architecture determines whether the field side operates as PROFIBUS PA or Foundation Fieldbus H1.

Supply path to field devices

  • Input source: A nominal 24 V DC feed powers the coupler through its protected supply input.
  • Field output: The integrated bus supply can deliver a combined maximum of 1 A to the PA segment.
  • Device loading: The total current demand of all connected instruments must stay within the segment-current limit.
  • Redundant feed: The lower-level bus can use one FDC 157 or one redundant coupler pair.

Front-panel diagnostic separation

  • DP activity: A yellow indicator reports communication activity on the PROFIBUS DP side.
  • PA activity: A separate yellow indicator reports traffic on the downstream fieldbus segment.
  • Fault location: Red BF and SF indicators distinguish a bus fault from a group error condition.
  • Supply state: The green ON indicator confirms that the 24 V input is present.

Electrical and environmental boundaries

  • Circuit separation: Backplane, DP, PA and supply circuits are electrically separated from one another.
  • Test level: The specified isolation test between circuit domains is 600 V DC.
  • Input protection: Reverse-polarity and overvoltage protection guard the 24 V supply connection.
  • Cabinet requirement: IP20 protection requires installation inside suitable protected equipment across the -25 to 60 °C operating range.
Description
Connecting two bus levels, Siemens 6ES7157-0AC85-0XA0 is the FDC 157 field device coupler in the SIMATIC bus-link system and forms the physical and data interface between PROFIBUS DP and a PROFIBUS PA or Foundation Fieldbus H1 segment.

DP communication enters 6ES7157-0AC85-0XA0 through the 9-pin Sub-D connection at up to 45.45 kbit/s. The coupler transfers that traffic to the 31.25 kbit/s fieldbus side so the lower-level field devices share one PA or FF segment.

A 24 V DC supply lets 6ES7157-0AC85-0XA0 provide as much as 1 A of segment current for up to 31 PA devices. One coupler or one redundant coupler pair can feed the lower-level bus, allowing the system design to choose a single or redundant supply path.

Front indicators on 6ES7157-0AC85-0XA0 separate DP activity, PA activity, bus fault, group fault and 24 V supply status. Electrical separation between the backplane, DP, PA and supply circuits keeps the communication domains isolated while diagnostics report the affected side.

The IP20 housing of 6ES7157-0AC85-0XA0 is intended for protected equipment, with operation specified from -25 to 60 °C. Reverse-polarity and overvoltage protection apply at the 24 V input before power is distributed to the coupler electronics and fieldbus segment.
Alternative Names
6ES71570AC850XA0 6ES 7157-0AC85-0XA0 6ES7157 0AC85 0XA0 Siemens 6ES7157-0AC85-0XA0 Siemens 6ES71570AC850XA0 6ES7157-0AC85-0XA0 FDC 157 FDC 157 6ES7157-0AC85-0XA0 6ES7157-0AC85-0XA0 field device coupler
Technical notes
Siemens 6ES7157-0AC85-0XA0 combines a 9-pin PROFIBUS DP connection, a powered PA/FF segment and dedicated activity and error LEDs in one FDC 157 module.
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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.
How does Siemens 6ES7157-0AC85-0XA0 bridge the higher-level and field-level buses?
Siemens 6ES7157-0AC85-0XA0 receives PROFIBUS DP through its 9-pin Sub-D interface and transfers communication to a PROFIBUS PA or Foundation Fieldbus H1 segment.
When planning a segment, what device count can Siemens 6ES7157-0AC85-0XA0 serve?
Siemens 6ES7157-0AC85-0XA0 supports up to 31 PA field devices, provided their combined segment demand remains within the 1 A output limit.
Which connector carries PROFIBUS DP into Siemens 6ES7157-0AC85-0XA0?
A 9-pin Sub-D connector is the PROFIBUS DP interface on Siemens 6ES7157-0AC85-0XA0, with a maximum DP rate of 45.45 kbit/s.
Can Siemens 6ES7157-0AC85-0XA0 be arranged as a redundant coupler pair?
Yes. Siemens 6ES7157-0AC85-0XA0 can be installed as one coupler or as one redundant pair feeding the lower-level fieldbus.
What do the separate activity and fault LEDs reveal on Siemens 6ES7157-0AC85-0XA0?
Siemens 6ES7157-0AC85-0XA0 separates DP activity, PA activity, bus fault, group error and 24 V supply status so the affected bus side can be identified.
Are the DP, PA and supply circuits electrically common inside Siemens 6ES7157-0AC85-0XA0?
No. Siemens 6ES7157-0AC85-0XA0 provides potential separation among the backplane, PROFIBUS DP, PROFIBUS PA and supply circuits, tested at 600 V DC.

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