3500/05-02-04-00-00-01 Bently Nevada Communication Gateway I/O Module

Description

3500/05-02-04-00-00-01 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 Modbus address of the first input status in the group to be

read. Note that each discrete input is allocated a Modbus Status Address. The

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

allowed ranges are 0 to 3683 (Zero referenced). Any address outside this range

for which a status is requested will result in the exception response “ILLEGAL

ADDRESS”. See Section Error! Reference source not found. for the mapping

of the Modicon PC Registers to the Communication Gateway I/O Module

(Modbus) data.

Number of Points

This 16-bit field contains the discrete points beginning at the “Start Address”.

The format of the Read Input Status response is shown below. The response

includes the slave address, function code, number of bytes of packed discrete

points being sent and the CRC check. The discrete points are packed into bytes

with 1 bit for each status (“1” = True/ON “0” = False/OFF). The lower order bit of

the first byte of data contains the first addressed input (point) and the remainder

follows. For input quantities not a multiple of eight, the last byte will be filled with

zeros in the high order bit positions.

Read Holding Registers Command

Use this command (function code 03) to obtain the following data from the

Communication Gateway I/O Module:

Setpoint Configuration Switch Settings

Configuration Lock Alarm Event List

System Event List Rack Date and Time

Rack Reset Rack Trip Multiply – Software

Rack Trip Multiply – Hardware Rack Alarm Inhibit – Software

Rack Alarm Inhibit – Hardware Last Command Success

Full-scale Data Range Repeated 3XXXX and 1XXXX Data

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135785-01 3500/93 Display Unit, non backlighted
135785-02 3500/93 Display Unit, back-lighted
137412-01 3500/93 Manual
135799-01 3500/93 Display Interface Module
135799-02 3500/93 Display Interface Module
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