User Guide
Table Of Contents
- 1. Safety
- 2. Modbus - general info
- 3. Modbus technical data
- 4. Modbus installation
- 5. Programming
- 5.2.1 Ethernet common settings (M5.8.1)
- 5.2.2 Modbus TCP settings (M5.8.2)
- 5.3.1 Modbus RTU Parameters
- 5.3.2 Modbus RTU monitoring values
- 5.4.1 Ethernet common settings
- 5.4.2 Modbus TCP settings
- 5.4.2.1 Common settings
- 5.4.3 Modbus TCP monitoring values
- 5.4.3.1 Connection 1
- 5.4.3.2 Connection 2
- 6.3.1 Coil registers
- 6.3.2 Input discrete registers
- 6.3.3 Holding and input registers
- 6.3.3.1 Drive Application ID’s
- 6.3.3.2 FB Process data IN
- 6.3.3.3 FB Process data OUT
- 6.3.3.4 ID map
- 6.3.3.5 Operation day counter
- 6.3.3.6 Resettable operation day counter
- 6.3.3.7 Energy counter
- 6.3.3.8 Resettable energy counter
- 6.3.3.9 Fault history
Honeywell • 34 Fault tracing
7. Fault tracing
When an unusual operating condition is detected by the AC drive control diagnostics, the drive
initiates a notification visible, for example, on the keypad. The keypad will show the ordinal
number of the fault, the fault code and a short fault description.
The fault can be reset with the Reset button on the control keypad or via the I/O terminal. The
faults are stored in the Fault history menu which can be browsed. The different fault codes you
will find in the table below. This fault table presents only the faults related to the fieldbus in use.
Note: When contacting distributor or factory because of a fault condition, always write down all
texts and codes on the keypad display and call Honeywell Technical Support at 888-516-9347
“Option 4”.
7.1 Typical fault conditions
Table 30. Typical fault conditions
7.2 RS-485 bus biasing
When none of the devices on the RS-485 bus is sending data all devices are in idle status. This
being the case, the bus voltage is in indefinte state, usually near 0 V due to the termination re-
sistors. This may cause problems in character reception because the single characters in serial
communcation begin with start bit referring to bus status '0' with voltage of less than -200mV
whereas the bus status '1' corresponds to bus voltage of more than +200mV. The RS-485 stan-
dard considers the voltage interval -200mV...+200mV as undefined state. Bus biasing is there-
fore needed to maintain the voltage in status ‘1’ (above +200mV) also between the messages.
To bias the bus you will have to add a separate active termination resistor specifically designed
for the RS-485 bus (e.g. Siemens active RS 485 terminating element (6ES7972-0DA00-
0AA0z).
Fault condition Possible cause Remedy
Termination resistor Missing or excessive termination resistor.
Install termination resistors
at both ends of the fieldbus
line.
Cabling
• Supply or motor cables are located
too close to the fieldbus cable
• Wrong type of fieldbus cable
• Too long cabling
Grounding Inadequate grounding.
Ensure grounding in all
points on the net
Connections
Faulty connections.
• Excessive stripping of cables
• Conductors in wrong terminals
• Too loose connections of conductors
Parameter
• Faulty address
• Overlapping slave addresses
• Wrong baud rate
• Wrong control place selected