Mitsubishi MELSEC

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Mech-MSR can communicate with external devices through Mitsubishi MELSEC. Before you read the following content, make sure that the communication configuration has been completed in Mech-MSR.

About Mitsubishi MELSEC

Mitsubishi MC series PLCs exchange data with Mech-MSR through the MC protocol. In this communication mode, Mech-MSR acts as the client and the PLC acts as the server.

Communication Workflow

The structure type used for communication occupies 200 D registers in total. The starting address of the structure variable must be the same as the configured D Register Start Address in Mech-MSR.

The workflow of Mitsubishi MELSEC communication is shown in the figure below.

  • The D register offset indicates the offset relative to the communication start address. In actual use, the absolute address of each signal in the PLC equals the start address plus the D register offset. For example, if D Register Start Address is set to D10000 in Mech-MSR, the address of CMD_ENABLE is D10000.0.

  • See Input Signals and Output Signals to learn the meaning of each signal.
handshake-workflow

Input Signals (from the PLC to Mech-MSR)

Name Description Data type D Register Offset

CMD_ENABLE

Enable

Boolean

0.0

CMD_TRIGGER

Command trigger

Boolean

0.1

DATA_READ_FINISHED

Data read finished

Boolean

0.2

RESET

Reset output data

Boolean

0.3

BIT_SPARE_1

Reserved

Boolean

0.4

BIT_SPARE_2

Reserved

Boolean

0.5

BIT_SPARE_3

Reserved

Boolean

0.6

BIT_SPARE_4

Reserved

Boolean

0.7

BIT_SPARE_5

Reserved

Boolean

0.8~0.15

WORD_SPARE_1

Reserved

Word[Signed]

1

COMMAND

Command code

Word[Signed]

2

CMD_PARAM_1

Command parameter 1

Word[Signed]

3

CMD_PARAM_2

Command parameter 2

Word[Signed]

4

CMD_PARAM_3

Command parameter 3

Word[Signed]

5

CMD_PARAM_4

Command parameter 4

Word[Signed]

6

CMD_PARAM_5

Command parameter 5

Word[Signed]

7

CMD_PARAM_6

Command parameter 6

Word[Signed]

8

CMD_PARAM_7

Command parameter 7

Word[Signed]

9

CMD_PARAM_8

Command parameter 8

Word[Signed]

10

CMD_PARAM_9

Command parameter 9

Word[Signed]

11

CMD_PARAM_10

Command parameter 10

Word[Signed]

12

VAR_1

Variable 1

Float

13~14

VAR_2

Variable 2

Float

15~16

VAR_3

Variable 3

Float

17~18

VAR_4

Variable 4

Float

19~20

VAR_5

Variable 5

Float

21~22

VAR_6

Variable 6

Float

23~24

VAR_7

Variable 7

Float

25~26

VAR_8

Variable 8

Float

27~28

VAR_9

Variable 9

Float

29~30

VAR_10

Variable 10

Float

31~32

WORD_SPARE_2

Reserved

Word[Signed]

33~63

CMD_ENABLE

Only when the enable signal is set to 1 are the other input signals considered valid.

CMD_TRIGGER

Mech-MSR reads the command code and command parameters only when the command trigger signal changes from 0 to 1 (rising edge). After Mech-MSR returns the Trigger Acknowledge signal, the command trigger signal can be set to 0.

DATA_READ_FINISHED

After the PLC finishes reading the data, set this signal to 1. Only after the Data Ready signal changes to 0 can this signal be set to 0.

RESET

When this signal is set to 1, the judgment results and measurement results received by the PLC (output) are cleared. At this point, the PLC can send a new command, and the related status codes are also reset.

COMMAND

The following table lists the supported commands in the current protocol and their corresponding command codes, command parameters, and descriptions.

Command Command Code Command Parameter Description

execute

1

Project ID. Only 1 project ID can be set at a time.

Used to trigger a project to run and obtain the project’s judgment results and measurement results.

trigger

2

Project ID. 1 to 4 project IDs can be set at a time.

Used to trigger a project to run.

return

3

Project ID. Only 1 project ID can be set at a time.

Used to obtain the judgment results and measurement results of the specified project.

judge

4

Used to obtain the overall quality judgment result of the specified project or the quality judgment results of individual measurement items.

value

5

Mainly used to obtain the measurement values of the specified project.

recipe

6

Project ID and parameter recipe ID.

Used to switch the parameter recipe used by a project.

solution

7

Solution ID.

Used to switch a solution.

SetNumVar

8

Global variable ID. Only 1 can be set at a time.

Used to set the value of a numeric global variable. The variable value is passed through VAR_INPUT.

GetNumVar

9

Global variable ID. Only 1 can be set at a time.

Used to read the value of a numeric global variable. The result is returned through VALUE.

VAR_INPUT

When the SetNumVar command is executed, the set value is written to VAR_INPUT.

Name Description Data Type D Register Offset

VAR_1

Variable 1

Float

13~14

VAR_2

Variable 2

Float

15~16

VAR_3

Variable 3

Float

17~18

VAR_4

Variable 4

Float

19~20

VAR_5

Variable 5

Float

21~22

VAR_6

Variable 6

Float

23~24

VAR_7

Variable 7

Float

25~26

VAR_8

Variable 8

Float

27~28

VAR_9

Variable 9

Float

29~30

VAR_10

Variable 10

Float

31~32

Output Signals (from Mech-MSR to the PLC)

Name Description Data type D Register Offset

HEARTBEAT

Heartbeat signal

Boolean

64.0

TRIGGER_ACKNOWLEDGE

Trigger acknowledge

Boolean

64.1

DATA_READY

Data ready

Boolean

64.2

EXEC_COMPLETED

Command execution completed

Boolean

64.3

BIT_SPARE_1

Reserved

Boolean

64.4

BIT_SPARE_2

Reserved

Boolean

64.5

BIT_SPARE_3

Reserved

Boolean

64.6

ERROR

Error

Boolean

64.7

OVERALL_JUDGE

Overall judgment result

Boolean

64.8

BIT_SPARE_4

Reserved

Boolean

64.9~64.15

WORD_SPARE_1

Reserved

Word[Signed]

65

STATUS_CODE

Status code

Word[Signed]

66

WORD_SPARE_2

Reserved

Word[Signed]

67

JUDGE

Judgment results

Boolean (0~63)

68

VALUE

Measurement results and variable values

Float (0~63)

72

HEARTBEAT

System heartbeat. It toggles every second. It can be used to determine whether the communication connection between the PLC and Mech-MSR is normal or disconnected.

TRIGGER_ACKNOWLEDGE

When Mech-MSR receives the rising edge of the Command Trigger signal, this signal is set to 1. When the command trigger signal falls, this signal is set to 0.

DATA_READY

Mech-MSR writes data to the output port and waits for the PLC to read it. When the Data Read Finished signal is 1, this signal is set to 0.

EXEC_COMPLETED

When command execution ends, this signal is set to 1, indicating that the command has been processed.

ERROR

When the status code returned by Mech-MSR is not 1, this signal is set to 1 to indicate an error.

OVERALL_JUDGE

The overall judgment result of the project. 1 indicates pass (OK), and 0 indicates fail (NG).

Quality judgment rules must be configured for the project in the Output Management window of Mech-MSR, and the measurement items considered during quality judgment must be determined. Only after the configuration is complete can valid quality judgment results be obtained.

STATUS_CODE

Mech-MSR may return the following status codes:

  • Normal status code: 1, indicating that the command was executed successfully.

  • Error status codes: -1, -2, -3, -4, and -5. See Error Codes for details.

JUDGE

The quality judgment results of measurement items added on the Communication Output tab in the Output Management window are returned here. 1 indicates pass (OK), and 0 indicates fail (NG).

Up to 64 judgment results can be output at one time for a single project.

VALUE

The VALUE module can return the following data:

  • The measurement results of the measurement items added on the Communication Output tab in the Output Management window.

  • The values of numeric global variables read when the GetNumVar command is executed.

Up to 64 measurement values can be output at one time for a single project.

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