Explicit Messaging
Explicit Messaging Using the MBP_MSTR Block Section 8.1
Explicit Messaging Using the MBP_MSTR Block
Configuring Explicit Messaging Using MBP_MSTR
Overview
You can use the MBP_MSTR function block to configure both Modbus TCP and EtherNet/IP connected and unconnected explicit messages.
The operation begins when the input to the EN pin is turned ON. The operation ends if the ABORT pin is turned ON, or if the EN pin is turned OFF.
The CONTROL and DATABUF output parameters define the operation.
NOTE: The structure and content of the CONTROL and DATABUF output parameters differ for explicit messages configured using the EtherNet/IP and Modbus TCP protocols. Refer to the topics
Configuring the Control Parameter for EtherNet/IP and Configuring the Control Parameter for
Modbus TCP for instructions on how to configure these parameters for each protocol.
The ACTIVE output turns ON during operation; the ERROR output turns ON if the operation aborts without success; the SUCCESS output turns ON at the successful completion of the operation.
EN and ENO can be configured as additional parameters.
Representation in FBD
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Input Parameters
Parameter
ENABLE
ABORT
Data type
BOOL
BOOL
Description
When ON, the explicit message operation (specified in the first element of the CONTROL pin) is executing.
When ON, the operation is aborted.
Output Parameters
Parameter
ACTIVE
ERROR
SUCCESS
Data type
BOOL
BOOL
BOOL
Description
ON when the operation is active.
OFF at all other times.
ON when the operation is aborted without success.
OFF before operation, during operation, and if operation succeeds.
ON when the operation concludes successfully.
OFF before operation, during operation, and if operation does not conclude successfully.
CONTROL
DATABUF
1
1
WORD
WORD
This parameter contains the control block. The first element contains a code describing the operation to be performed. The content of the control block depends on the operation. The structure of the control block depends on the protocol (EtherNet/IP or Modbus TCP).
Note: Assign this parameter to a located variable.
This parameter contains the data buffer. For operations that:
provide data — e.g., a write operation — this parameter is the data source
receive data — e.g., a read operation — this parameter is the data destination
Note: Assign this parameter to a located variable.
1. Refer to the topics Configuring the Control Block for EtherNet/IP and Configuring the
Control Block for Modbus TCP for instructions on how to configure these parameters for the
EtherNet/IP and Modbus TCP communication protocols.
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EtherNet/IP Explicit Messaging Using MBP_MSTR Section 8.2
EtherNet/IP Explicit Messaging Using MBP_MSTR
Overview
This section shows you how to configure the MBP_MSTR function block for EtherNet/IP explicit messages.
What Is in This Section?
This section contains the following topics:
Topic
EtherNet/IP Explicit Messaging Services
Configuring the CONTROL and DATABUF Parameters
MBP_MSTR Example: Get_Attributes_Single
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