RS485 INTERFACE (MODBUS RTU)

 

 

COMMUNICATIONS GUIDE

 

 

 

 

 

 

 

SLAVE RESPONSE

BYTES

EXAMPLE

DESCRIPTION

 

 

 

 

 

 

 

 

SLAVE ADDRESS

1

11

message from

 

 

 

 

 

slave 17

 

 

 

 

 

 

 

 

FUNCTION CODE

1

06

store single

 

 

 

 

 

setpoint

 

 

 

 

 

 

 

 

DATA STARTING ADDRESS

2

04 5C

setpoint address

 

 

 

 

 

04 5C

 

 

 

 

 

 

 

 

DATA

2

00 02

data stored in

 

 

 

 

 

setpoint address

 

 

 

 

 

04 5C

 

 

 

 

 

 

 

 

CRC

2

CB B9

CRC error code

 

 

 

 

 

 

 

Function Code 07H

Modbus Implementation: Read Exception Status

MM300 Implementation: Read Device Status

This is a function used to quickly read the status of a selected device. A short message length allows for rapid reading of status. The status byte returned will have individual bits set to 1 or 0 depending on the status of the slave device. For this example, consider the following MM300 general status byte:

The master/slave packets have the following format:

Table 5: Function code 7 bitmask

Bit

Function

0Alarm

1Trip

2Internal fault

3Auto

4Contactor A

5Contactor B

6Contact output 3

7Drive available (communications control)

Table 6: Master/slave packet format for function code 07H

MASTER TRANSMISSION

BYTES

EXAMPLE

DESCRIPTION

 

 

 

 

SLAVE ADDRESS

1

11

message for slave

 

 

 

17

 

 

 

 

FUNCTION CODE

1

07

read device status

 

 

 

 

CRC

2

4C 22

CRC error code

 

 

 

 

SLAVE RESPONSE

BYTES

EXAMPLE

DESCRIPTION

 

 

 

 

SLAVE ADDRESS

1

11

message from

 

 

 

slave 17

 

 

 

 

FUNCTION CODE

1

07

read device status

 

 

 

 

DEVICE STATUS (see

1

2C

status = 00101100

definition above)

 

 

(in binary)

 

 

 

 

CRC

2

22 28

CRC error code

 

 

 

 

8

MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE

Page 12
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GE MM300 manual Function Code 07H, Function code 7 bitmask, Master/slave packet format for function code 07H

MM300 specifications

The GE MM300 is a robust and versatile controller designed primarily for industrial automation applications. Built to tackle the demands of modern manufacturing environments, this controller offers a range of features that contribute to its popularity among engineers and operators.

One of the standout features of the GE MM300 is its scalability. The device can be easily configured to meet the needs of both small and large systems. Its modular architecture allows users to add or remove components based on the specific requirements of their applications, facilitating a more tailored approach to automation.

The MM300 supports various communication protocols, including Ethernet/IP, Modbus TCP, and more, ensuring seamless integration with a variety of devices and systems. This feature significantly enhances interoperability, allowing users to connect the controller to existing infrastructure without extensive reconfiguration.

In terms of processing power, the MM300 is equipped with a high-performance processor that can handle complex tasks with ease. With advanced data handling capabilities, it supports real-time data processing, enabling faster decision-making and improving overall operational efficiency. This capability is particularly beneficial for applications requiring precise control and monitoring.

Moreover, the GE MM300 boasts a user-friendly interface, featuring an intuitive programming environment that simplifies the development of control applications. This includes an integrated development environment (IDE) and support for popular programming languages, making it accessible for both seasoned programmers and those new to automation technologies.

The device is designed to operate in challenging industrial conditions, featuring a rugged construction that ensures durability and longevity. Its ability to withstand extreme temperatures, vibrations, and other environmental stressors enhances its reliability in demanding applications, which is crucial for minimizing downtime in production processes.

Security is another critical aspect of the GE MM300. The controller incorporates advanced security features to protect against unauthorized access and cyber threats, helping organizations ensure the integrity of their operations.

In summary, the GE MM300 stands out due to its scalability, versatile communication options, high processing capabilities, user-friendly programming environment, rugged design, and security features. These characteristics make it a reliable choice for industries seeking to enhance their automation processes and improve overall efficiency. Whether for small-scale or large-scale applications, the MM300 provides a comprehensive solution to meet the evolving needs of modern manufacturing.