Receive a Text Quote
We will send you price and availability shortly
Invalid number. Please call (800) 691-8511
Looking for a fast quote? Click here, and we'll text you.


Rated 5/5 on 3 reviews

Rate this product

MANUFACTURER: Control Techniques

DESCRIPTION: Profibus-DP Large Option Module


9 in stock
Ships Today

Free Shipping
2 Year warranty
Part NumberUD73
ManufacturerControl Techniques
Model #UD73
TypeOption Modules
Warranty2 Year
Profibus-DP ID Code 3345 Code 3345
Data Rate1.5 Mbits per second
Galvanic IsolationYes
Connector9 way D-type connector
Max Nodes to Netwrok32 nodes
Max line length (1.5 bits per s)200 m
Max repeaters ( between 2 stations) 3 repeaters
Screen Connection D-type shell
Pin connection Data3 Data
Pin connection /Data8/Data
Pin connection 0V Data5 0V Data
Pin connection remote power6 (+5V for line termination)

Our Repair Services

MRO Electric repairs CNCs, PLCs, Servo/Spindle Drives, Motors, Amplifiers, VFDs, HMIs, and more, most of which can be repaired in only 3-5 days.

Repair Benefits

MRO can restore your failed UD73 to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.

Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2 year warranty.

Our technicians have vast experience with most manufacturers and models. In addition to this UD73 we also repair drives, motors, PLCs and more, so if you don’t see the model you need, please contact us.

Core Exchange

If you are interested in getting credit for your faulty UD73, just let us know and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.

  • Shipping Weight : 1lb

Want it shipped today?

  • Order within the next 13 hours and 2 minutes.
  • If you order between 4pm and 6pm EST, you will be charged a small rush fee.

Ask about exchanging your faulty UD73 for credit when ordering from MRO Electric

MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

Additional Information

Control Techniques UD 73 Overview

The Profibus-DP operation card module UD 73 is manufactured by Control Techniques for the Unidrive system. The Control Techniques UD 73 is a Profibus-DP interface card. A large option module for the Unidrive, the UD 73 is an add-on card. Network activity is dedicated to an 80C32 processor and System Protocol Chip using a Dual-Port RAM interface to communicate data transfer with the UD 73.

Features of the Unidrive UD 73

The Control Techniques UD 73 has two Profibus DP 9-way, D-type connectors. These are denoted as A and B on the large option module. To more easily connect into a multi-drop bus, the connectors are sockets (female end). The sockets are connected in parallel by way of the circuit board.

The 9-way female connectors have D-type pins for the following: Data (3), /Data, (8), OV Data (5), Remote power (+5V) for line termination (6), screen (shell).

The metal D-type shell is connected to the screen of the cable using screw locks. The locks are fitted to keep proper contact between the shells.

As there is no termination resistor supplied on the UD 73 module, external provisions should be supplied on the last node of the network. In the space where the network termination resistor is installed, the drive node must remain powered up when the network is interfacing with the other nodes.  In case this is not happening, +5V and 0V may be run from another node that will always be powered up and +5V and 0V have to be run inside the screen of the Profibus-DP network cable.

Each line repeater adds one unit load to the line, so each line repeater is considered as replacing a network node. Each twisted pair must have a terminating resistor installed. This applies even if the twisted pair section runs between two line repeaters.

The maximum number of repeaters permissible between two line repeaters is three. The max number of nodes in a 4 section network is 122.  

The max number of nodes permissible for connection to a single network without the use of a repeater is 32 nodes.  The max line length at 1.5Mbits per second is 200m.

Normal downloaded DPL application programs retain full functionality on the UD 73. Program modifications are not necessary to use exiting DPL programs to run.

Mechanical Installation of the Control Techniques UD 73

For installation of the UD 73 large option module by Control Techniques, the Unidrive must be disconnected from the high voltage power supply. The same holds for the removal of a large option module, it must be disconnected from the high voltage power supply. The high voltage power supply must remain disconnected for 5 minutes for the DC Bus capacitors to discharge. The Large Option module will click firmly into place when it is properly inserted.


The Control Techniques UD 73 may be removed by pulling the black tab. As the tab is pulled, the module disengages from the connector and may be taken out of the Drive.

The Control Techniques UD 73 large option module comes with a two-year warranty.

Product Description

The UD73 is a Profibus-DP Large Option Module that is manufactured by Control Techniques. These products are manufactured in United Kingdom and are designed for Metal production, paper processing, and material conveying usage. All of the products come with a 2 year warranty from MRO Electric. We also carry Option Modules from other manufacturers such as Siemens and Yaskawa.

Related Products

Check out the rest of our Control Techniques product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or sending us an email at, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like UD73, take a look at more from our Option Modules line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our UD73 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.

5 stars

4.9 Overall Satisfaction Rating

Over 1650 Ratings from Actual Customers

Read Our Reviews

Very impressed with your company! Great customer service and fast turn around. Had the part that we needed in stock so t...


MRO had what I needed, detailed description, hassle free check out. Delivered in good shape and on time.


I truly appreciate the support that was given earlier this week. Glad to have found you and we will be doing more busine...


Customers We Work With

3M Logo
Motion Industries Logo
Caterpillar Logo
Vallen Logo
Ford Logo
IBM Logo
Gexpro Logo