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Siemens 6ES7972-0DA00-0AA0 SIMATIC DP RS485 Terminating Resistor

Siemens 6ES7972-0DA00-0AA0 SIMATIC DP RS485 Terminating Resistor

SIEMENS · SIMATIC DP

6ES7972-0DA00-0AA0

Active RS485 terminating element for PROFIBUS and MPI networks.

Supply 24 V DC (20.4 to 28.8 V)	Network PROFIBUS DP / MPI, up to 12 Mbit/s
Connection Screw terminal blocks	Protection IP20

Lead Time

In stock

Warranty

1 year

Email Inquiry [email protected]

WhatsApp +86 18159889985

Appurtenance:

siemens 6es7972 0da00 0aa0 simatic dp rs485 terminating resistor-1

Overview
Technical Data
Inquiry
Applications
Operation
Installation
Environment
FAQ
Recommend Models
Recommended Products

PRODUCT OVERVIEW

Independent Bus Termination

The Siemens 6ES7972-0DA00-0AA0 is an active RS485 terminating element designed to terminate PROFIBUS and MPI networks. Its separate 24 V DC supply allows the network termination function to be powered independently of connected bus stations.

Rated supply 24 V DC	Typical current 30 mA
Transmission rate 9.6 kbit/s to 12 Mbit/s	Housing size 60 × 70 × 43 mm

Technical Data

VERIFIED SPECIFICATIONS

Technical Data

Values below are taken from the Siemens product data sheet for the complete order number.

Complete model	6ES7972-0DA00-0AA0
Brand	Siemens
Product family	Active RS 485 terminating element
Product type	SIMATIC DP RS485 terminating resistor
Application	Termination of PROFIBUS and MPI networks
Rated supply voltage	24 V DC
Permissible supply range	20.4 to 28.8 V DC
Current consumption	30 mA typical
Power loss	0.72 W maximum
Interface	PROFIBUS DP
Transmission rate	9.6 kbit/s to 12 Mbit/s
Supply connection	Screw terminal block
PROFIBUS cable connection	Screw terminal block
Protection rating	IP20
Operating temperature	0 to 60 °C
Storage / transport temperature	-40 to 70 °C
Relative humidity	95% maximum at +25 °C
Dimensions (W × H × D)	60 × 70 × 43 mm
Weight	Approx. 95 g

Inquiry

CONTACT

STELLA

Email Inquiry [email protected]

WhatsApp +86 18159889985

Applications

NETWORK ROLE

Reliable End-of-Line Termination

This device is intended for the physical end of PROFIBUS or MPI networks where a defined RS485 termination is required. The separate 24 V DC supply keeps the active terminating element energized independently of the status of individual connected stations.

PROFIBUS DP Provides active termination for RS485 bus segments operating from 9.6 kbit/s to 12 Mbit/s.	MPI networks Supports termination of Siemens MPI network segments using the same active RS485 principle.
Maintenance continuity Independent supply separates the termination function from the power state of bus stations.	Panel integration Compact 60 × 70 × 43 mm enclosure with screw terminals for field wiring.

Operation

ELECTRICAL FUNCTION

How the Active Terminator Works

The 6ES7972-0DA00-0AA0 uses its own 24 V DC supply to maintain the electrical termination required at the end of an RS485 bus segment. This stabilizes the line independently of the connected PROFIBUS or MPI nodes.

Power input	Apply 24 V DC within the permitted 20.4 to 28.8 V range.
Current demand	Allow for 30 mA typical current consumption.
Thermal load	Maximum published power loss is 0.72 W.
Bus performance	The PROFIBUS DP interface supports 9.6 kbit/s through 12 Mbit/s.
Termination purpose	Use at the end of a PROFIBUS or MPI segment that requires an active RS485 termination.

Installation

FIELD CONNECTION

Installation Essentials

The official data sheet specifies screw terminal blocks for both the 24 V DC supply and the PROFIBUS conductors. Plan adequate enclosure space and preserve access to the terminals during wiring and inspection.

Mechanical envelope	Allow at least 60 mm width, 70 mm height and 43 mm depth for the device body.
Supply wiring	Use the dedicated screw terminal block and keep the applied DC voltage within 20.4 to 28.8 V.
Bus wiring	Terminate the PROFIBUS cable on the specified screw terminal block.
Location	Install in an environment compatible with IP20 protection.
Commissioning check	Verify supply polarity, secure terminal clamping and correct placement at the end of the intended bus segment.

Environment

OPERATING LIMITS

Protection and Environment

Apply the published environmental limits when selecting the cabinet location and transport conditions for this active terminating element.

Operation 0 to 60 °C	Storage / transport -40 to 70 °C
Relative humidity Up to 95% at +25 °C	Degree of protection IP20

The Siemens data sheet lists general product approvals, EMC entries, hazardous-location approvals and maritime application approvals on page 2. Confirm the exact certificate required by the destination project against the current official document.

FAQ

BUYER AND ENGINEER CHECKLIST

FAQ

Six practical checks for sourcing the exact Siemens active RS485 terminating element.

Q1. How can a buyer verify that the quotation is for the exact device?

The quotation, nameplate photo and packing label should all show 6ES7972-0DA00-0AA0. Cross-check the description as a SIMATIC DP active RS485 terminating element for PROFIBUS/MPI networks, not a passive bus connector or another 6ES7972 variant.

Q2. How can New, Used and Refurbished condition be distinguished?

Request current high-resolution photos of the housing, screw terminals, rating label and packaging. Terminal marks, scratches, replacement labels or opened packaging should be reconciled with the stated condition before payment.

Q3. What demonstrates that an industrial automation supplier is legitimate?

Use a quotation that identifies the legal company, bank beneficiary and complete part number. Verify company registration and payment details independently, and require traceable written communication that references this exact Siemens order number.

Q4. Which engineering points should be checked before purchase?

Confirm 24 V DC supply with a 20.4 to 28.8 V permitted range, PROFIBUS/MPI use, 9.6 kbit/s to 12 Mbit/s transmission, screw terminal connections, 60 × 70 × 43 mm dimensions, IP20 protection and the site temperature range.

Q5. What physical evidence should be requested before payment?

Ask for dated photos of the actual unit, readable nameplate, both terminal areas and packaging. If the supplier claims testing, request the test scope and result; if the unit is sold as new, request evidence consistent with unopened or unused condition.

Q6. Can a similar 6ES7972 suffix be substituted?

Do not approve a suffix change solely because the family number is similar. The replacement must be reviewed for active termination function, 24 V supply range, bus interface, wiring method, dimensions and environmental limits before acceptance.

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