Emerson Mentor MP User Manual

Parameter structure
Keypad and display
Parameter x.00
Parameter
description
protocol
Performance
The
2bit
type
field
selects
the
data
type
according
to
the
table
below:
If
a
32bit
data
type
is
selected
then
the
slave
uses
two
consecutive
16bit
Table
6
-
9
Master
request
Table
6
-
10
Slave
response
Writes
when
actual
parameter
type
is
different
from
selected
Reads
when
actual
parameter
type
is
different
from
6.2.8
Exceptions
format
Advanced parameter
descriptions
Serial comms
MODBUS registers (in 'big endian'). The master must also set the
correct 'number of 16bit registers'.
Example, read #20.21 through #20.24 as 32bit parameters using FC03
from node 8:
The slave will allow writing a 32 bit value to a 16 bit parameter as long as
the 32 bit value is within the normal range of the 16 bit parameter.
The slave will allow a 16 bit write to a 32 bit parameter. The slave will
sign extend the written value, therefore, the effective range of this type of
write will be ±32767.
Examples, if #1.28 has a range of ±100000, and #1.29 has a range of
±10000.
selected
The slave will send the least significant word of a 32 bit parameter if that
parameter is read as part of a 16 bit access.
The slave will sign extend the least significant word if a 16 bit parameter
is accessed as a 32 bit parameter. The number of 16 bit registers must
be even during a 32 bit access.
Example, If #1.28 is a 32 bit parameter with a value of 0x12345678,
#1.29 is a signed 16 bit parameter with a value of 0xABCD, and #1.30 is
a signed 16 bit parameter with a value of 0x0123.
The slave will respond with an exception response if an error is detected
Read
Start
register
address
Number
of 16bit
registers
Response Comments
#1.28
127
1
0x5678
Standard
16
bit
access
to a 32bit register will
return low 16bit word of
truncated data
#1.28
16511
2
0x12345678
Full
32bit
access
#1.28
16511 1 Exception 2
Number
of
words
must
be even for 32bit access
#1.29
128
1
0xABCD
Standard
16
bit
access
to a 32bit register will
return low 16bit word of
data
#1.29
16512 2 0xFFFFABCD
32bit
access
to
a
16bit
register will return 32bit
sign extended data
#1.30
16513 2 0x00000123
32bit
access
to
a
16bit
register will return 32bit
sign extended data
#1.28
-
#1.29
127
2
0x5678,
0xABCD
Standard
16
bit
access
to a 32bit register will
return low 16bit word of
truncated data
#1.28
-
#1.29
16511 4
0x12345678,
0xFFFFABCD
Full 32bit access
Write
Start
register
address
Number
of 16bit
registers
Data Comments
#1.28
127 1 0x1234
Standard
16
bit
write
to
a
32bit register. Value
written = 0x00001234
#1.28
127 1 0xABCD
Standard
16
bit
write
to
a
32bit register. Value
written = 0xFFFFABCD
#1.28
16511 2 0x00001234
Value
written
=
0x00001234
#1.29
128
1
0x0123
Value
written
=
0x0123
#1.29
16512 2 0x00000123
Value
written
=
0x00000123
Byte
Value
Description
0
0x08
Slave
destination
node
address
1
0x03
FC03
multiple
read
2 0x10
Length
of
data
(bytes)
=
4x32bit
registers
=
16bytes
3-6
#20.21
data
7-10
#20.22
data
11-14
#20.23
data
15-18
#20.24
data
19
CRC
LSB
20
CRC
MSB
Byte
Value
Description
0
0x08
Slave
destination
node
address
1
0x03
FC03
multiple
read
2
0x47
Start register address #20.21
(16384 + 2021 - 1) = 18404 = 0x47E4
3
0xE4
4
0x00
Number
of
16bit
registers
to
read
#20.21 through #20.24 is 4x32bit registers =
8x16bit registers
5 0x08
6
CRC
LSB
7
CRC
MSB
Type field
bits 15-14
Selected data
type
Comments
00
INT16
backward
compatible
01
INT32
10 Float32
IEEE754
standard
Not supported on all slaves
11
Reserved

Emerson Mentor MP Specifications

General

Brand	Emerson
Model	Mentor MP
Category	DC Drives
Language	English