Specifications

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Allen-Bradley DH+/DH-485 Device Driver Help
Type
Description
Boolean
Single bit
Byte
Unsigned 8 bit value
Char
Signed 8 bit value
Word
Unsigned 16 bit value
Short
Signed 16 bit value
DWord
Unsigned 32 bit value
Long
Signed 32 bit value
BCD
Two byte packed BCD, four decimal digits
LBCD
Four byte packed BCD, eight decimal digits
Float
32 bit IEEE Floating point
String
Null terminated character array
Note: The DWord, Long and LBCD data types are not native to any of the PLC models.
When referencing a 16 bit location as a 32 bit value, the location referenced will be the low word, and the next
successive location will be the high word. For example: If N7:10 is selected as a DWord data type, N7:10 would be the
low word and N7:11 would be the high word.
Error Descriptions
The following error/warning messages may be generated. Click on the link for a description of the message.
Address Validation
Missing address
Device address '<address>' contains a syntax error
Address '<address>' is out of range for the specified device or register
Device address '<address>' is not supported by model '<model name>'
Data Type '<type>' is not valid for device address '<address>'
Device address '<address>' is read only
Array size is out of range for address '<address>'
Array support is not available for the specified address: '<address>'
Device Status Messages
Device '<device name>' is not responding
Unable to write to '<address>' on device '<device name>'
Failed to Connect to device '<device name>'
Device Specific Messages
Unable to read data starting at address <address> on device '<device name>'. Frame received contains
errors
Unable to read data starting at address <address> on device '<device name>'. [STS=<value>, EXT
STS=<value>]. Tag deactivated
Unable to write to address <address> on device '<device name>'. Frame received contains errors
Unable to write to address <address> on device '<device name>'. [STS=<value>, EXT STS=<value>]
AB card specific error Descriptions
The following error/warning messages may be generated. Click on the link for a description of the message.
Configuration/Communication
Failed to locate Channel 'PKTX Channel ID' of card 'PKTX Card ID'
Failed to perform M16 Diagnostic for base address <memory address>'
Failed to write to Dual Port memory for device: <Device Name>