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HVAC Drive H300 181
Issue Number: 3
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.
10.3.9 CRC
The CRC is a 16 bit 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.
10.3.10 Device compatibility parameters
All devices have the following compatibility parameters defined:
10.4 BACnet specification
The tables in the following sections describe the BACnet objects that are available on the drive. The device object is also produced when queried by
a master on the network.
The Present Value property of each of the objects can be accessed in the manner indicated in the right-hand column of each of the object tables. The
three access types are as follows:
The supported properties for each of the supported object types are given in the table below:
*Only commandable objects will have priority_array and Relinquish_Default properties.
**The polarity property is read-only for all objects that support it, and can only be changed via the invert parameter associated with the input/output
represented by the object.
Parameter Description
Device ID Unique device identification code
Minimum slave response time
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.
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
Baud rate Baud rate used by Modbus RTU
32 bit 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.
Code Type Description
RO Read only The present value of these objects can only be read
RW Read/write
The present value property of these objects can be both read from and written to.
Writes from different BACnet devices will overwrite each other
C Commanded
The present value property of these objects can be both read from and written to. Writes are
accompanied by a priority level in the range 1 to 16, the underlying drive parameter is set to the
value written at the highest priority level. All commandable objects support a writeable relinquish
default property. The value of this property becomes the present value when no priority is provided.
Object Property
Binary
input
Binary
output
Binary
value
Analog
input
Analog
output
Analog
value
Object_Identifer
333333
Object_Name
333333
Object_Type
333333
Present_Value
333333
Status_Flags
333333
Event_State
333333
Reliability
333333
Out_Of_Service
333333
Units
xxx333
Priority_Array*
x 33 x 33
Relinquish_
Default*
x 33 x 33
Polarity**
33 xx x x
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