Control Techniques UD71

Control Techniques UD71 Serial Communications

Discover the heart of communication in automation with Control Techniques UD71 Serial Communications. From installation to parameter intricacies, delve into UD71's role in seamless drive integration. 

Installation:

Switch off the Unidrive and disconnect it from the supply for 15 minutes. Insert the Large Option Module, ensuring a correct connection. Utilize the appropriate connecting cable from Table 1 and connect it to the correct connector on the Large Option Module.

Hardware Connections:

Follow Table 1 for EIA RS485 communications port connections. The pin configurations for 4-wire and 2-wire modes are provided in detail.

Software Parameters:

Configure parameters such as Serial Address, Serial Mode, Baud Rate, Two Wire Mode, Serial Programmable Source/Destination, and Scale Factor. Understand the ranges and default settings for each parameter.

Serial Communications Modes:

Explore three modes: ANSI Mode, OUTPUT Mode, and INPUT Mode. ANSI Mode utilizes 4-wire EIA RS485 with the ANSI protocol. OUTPUT and INPUT Modes use high-speed binary protocols for continuous data transfer.

Parameter Description:

Understand parameters like Serial Address (11.23), Serial Mode (11.24), Baud Rate (11.25), Two Wire Mode (11.26), and Serial Programmable Source/Destination (11.27). Serial Scale Factor (11.28) allows data scaling in serial modes 1 or 2.

Control and Addressing:

Learn the addressing structure with Group Address and Unit Address. Control characters (EOT, ENQ, STX, etc.) facilitate drive communication. Group addressing enables commands to multiple units simultaneously.

Reading and Writing Data:

Reading involves sending structured messages and receiving corresponding data. Writing data requires a specific message structure, including Group Address, Unit Address, Menu, Parameter, Data, and Block Checksum. Understand the process of re-writing data for subsequent write messages.

Calculating Block Checksum (BCC):

Use the XOR function for BCC calculation. An example and QuickBasic program are provided for better understanding.

The Control Techniques UD71 Serial Communications guide offers detailed insights into installation, hardware connections, software parameters, communication modes, addressing, and data transmission. This ensures efficient utilization of the serial communications link for Unidrive systems.

FAQ - Control Techniques UD71 Serial Communications:

1. What is the purpose of the UD71 Serial Communications link?

• The serial communications link enables the integration of one or more drives into systems controlled by a host unit, such as a PLC or computer.

2. How many devices can be connected in a single group using the EIA RS485 standard?

• In two-wire mode, up to seven drives can be connected in a single group, and up to 15 drives if the four-wire mode is used.

3. What are the hardware connections for the EIA RS485 communications port?

• Refer to Table 1 for detailed hardware connections, including pin configurations for 4-wire and 2-wire modes.

4. What parameters are essential for configuring the serial communications link?

• Parameters such as Serial Address, Serial Mode, Baud Rate, Two Wire Mode, Serial Programmable Source/Destination, and Scale Factor play a crucial role in configuration.

5. How does group addressing work in UD71 Serial Communications?

• Each drive on an ANSI communications bus is assigned a unique identity with a Group Address and Unit Address. Group addressing allows commands to be sent to all units of a specific group simultaneously.

6. Can data be transferred between drives using UD71 Serial Communications?

• Yes, UD71 supports high-speed binary protocols in OUTPUT and INPUT Modes, facilitating data transfer between drives.

7. What is the purpose of the Block Checksum (BCC) in data transmission?

• BCC is calculated to ensure the integrity of messages during transmission, preventing data corruption. It is essential for reliable communication.

8. How can I read and write data to UD71 parameters?

• Reading involves sending structured messages, and writing requires a specific message structure, including Group Address, Unit Address, Menu, Parameter, Data, and Block Checksum.

9. Can I re-write data to a drive parameter without re-transmitting the address?

• Yes, once a WRITE message with the address field has been accepted, subsequent write messages to that drive can use a re-write message structure, saving time during data monitoring.

10. Is there a limit to the number of devices that can be operated when using line buffers?

• When line buffers are used, up to 81 devices can be operated, organized in up to 9 groups of 9. This allows flexible control without affecting other devices or groups.

These FAQs provide a quick reference for common queries related to UD71 Serial Communications, covering installation, configuration, data transfer, and addressing.Control Techniques products are manufactured in United Kingdom and are designed for Metal production, paper processing, and material conveying usage. They come with a 2-year warranty from MRO Electric. We also carry Option Modules from other manufacturers such as Siemens and Yaskawa.

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