Description

ABB PP846A module

Contact: Mr. Lai
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Mainly introduces ACS380 Modbus communication function

ABB ACS380 is a high-performance fully compatible mechanical transmission with reliable performance and simple integration.

The power range is 0.25-22KW, which is applicable to various industrial applications and environments, including printing, packaging, pharmaceutical, electronic and electrical, logistics, textile, rubber, plastic, building materials, food, beverage, tobacco machinery, water industry, etc. The whole series of built-in Modbus RTU communication. This article mainly introduces the ACS380 Modbus communication function.

1. Hardware interface

Remove the outer cover plate, and the gray terminal on the right side is RS-485 interface

2. Parameter setting

Control macro set to Modbus

Or set parameters directly (take scalar control as an example)

58.01=1； Enable built-in modbus

58.03=1 ； Station address

58.04=3； Baud rate 19.2

58.05=2 ； Data format 8 even 1

20.01=14； External 1 command built-in fieldbus

28.11=8； External 1 frequency setting value 1 selects built-in field bus

3. Notice for communication

The data exchange between the master station and the frequency converter includes two parts: circular communication and non circular communication,

661bf4fa-63b9-11ed-8abf-dac502259ad0.png

CW: control word, used to send start, stop, reset and other commands;

SW: status word, monitoring status, such as whether there is a fault;

REF1/2: given value

ACT1/2: actual value

Data input/output: parameters 58.101~58.114 are mapped to Modbus holding register addresses 400001~400014

Acyclic communication can directly read and write the Modbus logic address of the parameter.

6631f48a-63b9-11ed-8abf-dac502259ad0.png

By default:

66407db6-63b9-11ed-8abf-dac502259ad0.png

ABB Transmission Protocol Control Word and Status Word Definitions

66511702-63b9-11ed-8abf-dac502259ad0.png

ABB Transmission Protocol Status Chart

66b1fb1c-63b9-11ed-8abf-dac502259ad0.png

4. Communication realization

In order to more intuitively introduce the Modbus communication of ACS380, the ModScan is used as the Modbus master station to test it

66c43f66-63b9-11ed-8abf-dac502259ad0.png

40,001 Write 047FH to start the frequency converter; 40002 is written to 4E20H (decimal 20000), and the frequency converter operates at 50HZ; The actual value of 40005 act1 is 4E20H;

5. Summary

Common command operation (control word 40001)

Operation: 047Fh

stop it:

? 477h=stop according to 21.03 parking mode ? 47Eh=OFF1 slope parking (note: uninterrupted slope parking)

Fault reset: 04FEh

Speed setting

40002 is written to the given value, and the reverse is written to the negative value. The conversion relationship is as follows:

66d4520c-63b9-11ed-8abf-dac502259ad0.png

For example, under scalar control, the 46.02 parameter defaults to 50HZ, which means that 50HZ corresponds to 20000,

That is, 20000 is written to 40002, and the inverter outputs 50HZ.

Common status monitoring

Actual value 1, read 40005

Note: The read value is converted by 46.02, that is, the actual output frequency (HZ) can be obtained after dividing by 400

Motor current (01.07), read 40,107

DC bus voltage (01.11), read 40111

66e2cecc-63b9-11ed-8abf-dac502259ad0.png View through the panel 01.11=326.00V

Current fault code, read 40401

When the motor is disconnected, the transducer panel gives an alarm of 3381hex, and the communication reads 40401 to display the current fault code;

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ABB PP846A module

Description

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