Emerson Mentor MP User Manual

Parameter structure
Keypad and display
Parameter x.00
Parameter
description
protocol
Performance
The
slave
exception
message
has
the
following
format.
Exception
codes
The
following
exception
codes
are
supported.
Parameter
over
range
during
block
write
FC16
All
devices
have
the
following
compatibility
parameters
defined:
Exception message format
format
Advanced parameter
descriptions
Serial comms
The slave processes the write block in the order the data is received. If a
write fails due to an out of range value then the write block is terminated.
However, the slave does not raise an exception response, rather the
error condition is signalled to the master by the number of successful
writes field in the response.
Parameter over range during block read/write FC23
There will be no indication that there has been a value out of range
during a FC23 access.
6.2.9 CRC
The CRC is a 16bit cyclic redundancy check using the standard CRC-16
polynomial x16 + x15 + x2 + 1. The 16bit CRC is appended to the
message and transmitted LSB first.
The CRC is calculated on ALL the bytes in the frame.
6.2.10 Device compatibility parameters
210 Mentor MP Advanced User Guide
www.onxcontrol.com Issue Number: 4
Parameter
Description
Device
ID
Unique
device
identification
code
Minimum
slave
response
time
Maximum slave response
time
When
global
addressing,
the
master
must wait for this time before issuing a
new message. In a network of devices,
the slowest time must be used
Maximum
baud
rate
32bit float data type
supported
If
this
data
type
is
not
supported
then
an
over range error will be raised if this data
type is used
Maximum
buffer
size
Determines
the
maximum
block
size.
Byte
Description
0
Slave
source
node
address
1
Original
function
code
with
bit7
set
2
Exception
code
3
CRC
LSB
4
CRC
MSB
Code
Description
1
Function
code
not
supported
2
Register
address
out
of
range,
or
request
to
read
too
many
registers

Emerson Mentor MP Specifications

General

Brand	Emerson
Model	Mentor MP
Category	DC Drives
Language	English