ABB MTA0020 HB010662R0120 BOARD

Description

The master sends a message addressed to a single slave.

Normal Response

After the slave performs the function requested by the query, it sends back a normal response for

that function. This indicates that the request was successful.

Error Response

The slave receives the query, but cannot perform the requested function. The slave sends back an

error response that indicates the reason the request could not be processed. (No error message will

be sent for certain types of errors. For more information, refer to Communication Errors below.)

Broadcast

The master sends a message addressed to all the slaves by using address 0. All slaves that receive

the broadcast message perform the requested function. This transaction is ended by a time-out

within the master.

All message fields, other than the Station Address field, Function Code field, and Error Check field are

called, generically, information fields. Information fields contain additional information required to

specify or respond to a requested function. Different types of messages have different types or

numbers of information fields. (Details on information fields for each message type and function code

are found in RTU Message Descriptions. Some messages (Message 07 Query and Message 17 Query)

do not have information fields.

Examples

As shown in the following figure, the information fields for message READ OUTPUT TABLE (01) Query

consist of the Starting Point No. field and Number of Points field. The information fields for message

READ OUTPUT TABLE (01) Response consist of the Byte Count field and Data field.

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