Nidec Unidrive M200 User Manual page 60

Safety Product Mechanical
information information installation
Start Number
Write register of 16 bit
address registers
Pr 01.028 127 1
Pr 01.028 127 1
Pr 01.028 16511 2
Pr 01.029 128 1
Pr 01.029 16512 2
* Bit 14 is set to allow 32 bit access
8.6.8 Exceptions
The slave will respond with an exception response if an error is detected
in the master request. If a message is corrupted and the frame is not
received or the CRC fails then the slave will not issue an exception. In
this case the master device will time out. If a write multiple (FC16 or
FC23) request exceeds the slave maximum buffer size then the slave
will discard the message. No exception will be transmitted in this case
and the master will time out.
Exception message format
The slave exception message has the following format.
Byte
0 Slave source node address
1 Original function code with bit 7 set
2 Exception code
3 CRC LSB
4 CRC MSB
Exception codes
The following exception codes are supported.
Code
1 Function code not supported
Register address out of range, or request to read too many
2
registers
Parameter over range during block write FC16
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.
8.6.9 CRC
The CRC is a 16bit cyclic redundancy check using the standard CRC-16
polynomial x16 + x15 + x2 + 1. The 16 bit CRC is appended to the
message and transmitted LSB first.
The CRC is calculated on ALL the bytes in the frame.
60
Electrical Getting Basic
installation started parameters
Data Comments
Standard 16 bit write
to a 32bit register.
0x1234
Value written =
0x00001234
Standard 16 bit write
to a 32 bit register.
0xABCD
Value written =
0xFFFFABCD
Value written =
0x00001234
0x00001234
Value written =
0x0123
0x0123
Value written =
0x00000123
0x00000123
Description
Description
Running the NV Media
Optimization
motor Card
8.6.10 Device compatibility parameters
All devices have the following compatibility parameters defined:
Parameter
Device ID
Minimum slave response
time
Maximum slave response
time
Maximum baud rate
32 bit float data type
supported
Maximum buffer size
Onboard Advanced
Diagnostics
PLC parameters
Description
Unique device identification code
The minimum delay between the end of a
message from the master and the time at
which the master is ready to receive a
response from the slave. Refer to para
11-26
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
If this data type is not supported then an
over range error will be raised if this data
type is used
Determines the maximum block size.
Unidrive M200 / M201 Control User Guide
Issue Number: 2
UL Listing