44 Rockwell Automation Publication 6000-TD004D-EN-P - November 2017
Chapter 2 Parameter Descriptions
Interpreting Bit-Encoded Parameters
Most bit-encoded parameters follow a basic format. A one (1) in an associated bit
represents a true or active condition. A zero (0) in an associated bit represents a
false or inactive condition.
The methodology is best illustrated using an example:
Power Cell Fault Mask
Linear Number: P010
Default Value: 32767
Minimum Value: 0
Maximum Value: 32767
Access Level: R&D
Read/Write: Read/Write
Modify Level: Online/Offline
This parameter allows user to select which faults related to a power cell can be
masked.
The description in the manual will always be structured in the same way. The top
description (in this case, IGBT set#1 over current in powercell) is always the
least-significant bit, or right-most bit. As you move down the list of descriptions,
you move to the left on the bit-encoded word. Any unused bits in the middle of a
word will be identified, but unused bits in the middle of a word will have no
description. This is why a 16-bit word may only have a few descriptions. The rest
are reserved for future expansion.
When a bit-encoded parameter is viewed in its associated group, it is actually
displayed as a hexadecimal number. The right-most four bits represent the right-
most hexadecimal digit. Each subsequent group of 4 represents the next hex digit.
Bit Enum Text Description
0 IGBT set#1 over current in powercell 1 = Over current, 0 = Normal
1 IGBT set#2 over current in powercell 1 = Over current, 0 = Normal
2 Input over voltage in powercell 1 = Over voltage, 0 = Normal
3 DC Bus under voltage in powercell 1 = Low voltage, 0 = Normal
4 Abnormal communication in powercell 1 = Abnormal, 0 = Normal
5 No PWM1 pulse for IGBT set#1 in powercell 1 = Abnormal, 0 = Normal
6 No PWM2 pulse for IGBT set#2 in powercell 1 = Abnormal, 0 = Normal
7 IGBT set#1 failed to turn on in powercell Reserved
8 IGBT set#2 failed to turn on in powercell Reserved
9 Powercell bypass 1 = Abnormal, 0 = Normal
10 Over temperature in powercell 1 = Abnormal, 0 = Normal
11 Powercell failed to bypass 1 = Abnormal, 0 = Normal
12 One phase Lost in powercell 1 = Abnormal, 0 = Normal
13 Two phase Lost in powercell 1 = Abnormal, 0 = Normal
14 Input over voltage warning in powercell 1 = Abnormal, 0 = Normal
15 Reserved
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