3500/05-02-05-00-00-01 Bently Nevada Rack frame

Description

3500/05-02-05-00-00-01 Address

Address is the 16-bit Modbus address corresponding to the register. The higher

order byte is transmitted first followed by the lower order byte. The allowed

ranges are 0 -3, 6 -13, 30 – 31, 87 – 96, and 98 (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.

Data

Data is the 16-bit word that will be written to the address.

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 address corresponding to the starting value.

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

allowed ranges are 4000 – 4003, 5000 – 5500, and 6000 – 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.

If the addressed Communication Gateway I/O Module (Modbus) receives a query

frame without a communications error and if some condition stops the

Communication Gateway I/O Module (Modbus) from responding, the interface

returns an exception response containing the appropriate error code to the

master.

The high order bit (Hex 80) of the function code field is set to “0” in a query or

normal response frame and “1” in an exception response. And regardless of the

function code, the information field of all exception response frames is one byte

long. This byte contains the exception code, defined below.

Most significant byte of the 3500 monitoring system in HEX (0D).

Family ID LSB

Least significant byte of the 3500 monitoring system in HEX (AC).

Major Rev Number

Changed when a major firmware revision occurs.

Minor Rev Number

Changed when a minor firmware revision occurs.

Modbus Application Protocol (MBAP)

MBAP is the implementation of the Modbus protocol on TCP/IP Ethernet

network. MBAP is the same as the Modbus protocol with a few minor

exceptions. These exceptions are necessary to properly operate on a non

deterministic network.

MBAP supports function code 2,3, 4, 6, and 16. All data can be read through

function codes 2, 3, and 4. All data can be written through function codes 6 and

16; however, only one value can be changed per command. Using function code

16 to write two registers is only valid for floating point values. All other writes are

for single registers.

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