3500/05-02-04-01-00-00 Bently Nevada Modbus input data

Description

3500/05-02-04-01-00-00 The data fields and their meanings are described in the following paragraphs.

The slave address and the CRC check have the same format and meaning as

described in earlier sections.

Start Address

Start Address is the 16-bit Modbus holding register address corresponding to the

starting value. The higher order byte is transmitted first followed by the lower

order byte. The allowed ranges are 0 to 6999 (Zero referenced). Any address

outside this range will result in the exception response “ILLEGAL ADDRESS”.

See page 37 for the mapping of the Modicon PC Registers to the Communication

Gateway I/O Module (Modbus) data.

Number of Registers

This 16-bit field is the number of values to be obtained beginning at the “Start

Address”.

The format of the response to Read Holding Registers is shown below. The

response includes the slave address, function code, number of bytes of data

being sent, and the CRC check. The contents of the registers requested are two

bytes each: the first byte is the high order and the second byte is the lower order.

Note that the Byte Count is the number of bytes in the data portion of the

response or two times the number of registers.

The data fields and their meanings are described in the following paragraphs.

The slave address and the CRC check have the same format and meaning as

described in earlier sections.

Start Address

Start address is the 16-bit Modbus input data register address corresponding to

the first register. The higher order byte is transmitted first followed by the lower

order byte. The allowed ranges are 0 to 956 (Zero referenced). Any address

outside this range will result in the exception response “ILLEGAL ADDRESS”.

See page 37 for the mapping of the Modicon PC Registers to the Communication

Gateway I/O Module (Modbus) data.

Number of Registers

This 16-bit field is the number of values to be obtained beginning at the “Start

Address”. The maximum number of input registers read in a single query is

limited to 125 registers by the Communication Gateway I/O Module and may be

limited by the DCS controller. Refer to the appropriate DCS controller manual for

more information.

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