Appendix C—Optional Communication Cards
Power Xpert C445 Global Motor Management Relay
MN042003EN—January 2019
www.eaton.com
297
Acyclic Message Examples
Example #1
: Read the Active Fault Code from the C445.
The Active Fault Code is Modbus register 312
(address = 311) from
Appendix D
. This register
address is converted to two hexadecimal bytes and
two decimal bytes below:
01 37 hexadecimal
01 55 decimal
Note
: The byte format depends on the PROFIBUS
master.
The following two acyclic messages must be sent by
the PROFIBUS master to the C445 to read the Active
Fault Code:
1. Acyclic write message:
Slot 0
Index 45
Length 4 bytes
03 Modbus read command
01 37 hex or 01 55 decimal
01 length (1 register to read)
2. Acyclic read message:
Slot 0
Index 45
Length 2 bytes
Example #2
: Write to the Base Control Module Field Output
Control word.
The Modbus register address for this parameter from
Appendix D
is 601 (address = 600). This register is
converted to two hexadecimal bytes or two decimal
bytes below:
02 58 hexadecimal
02 88 decimal
Note
: The byte format depends on the PROFIBUS
master.
The following acyclic message must be sent to write a
value of 128 to the System Services register to issue a
Soft Reset (bit 6 = 1, so the value is 64 decimal).
1. Acyclic write message:
Slot 0
Index 45
Length 5 bytes
Data Field:
06 Command
02 58 hexadecimal or 02 88 decimal
Data: 00 40 hexadecimal or 00 64 decimal
