Installation manual

Publication 1747-RM001G-EN-P - November 2008
12-54 SLC Communication Instructions
• Class (hex)/(dec)
Possible Classes are 0 to FF (hex). See Volume 1 of the CIP Common
Specification for the list of defined Classes. You may either enter in a
hexadecimal Class value in the (hex) field or a decimal Class value in the
(dec) field.
• Instance (hex)/(dec)
Possible Instances are 0 to FFFF (hex). See Volume 1 of the CIP
Common Specification for the list of valid Instances for each Class. You
may either enter in a hexadecimal Instance value in the (hex) field or a
decimal Instance value in the (dec) field.
• Attribute (hex)/(dec)
Possible Attributes are 0 to FF (hex). See Volume 1 of the CIP
Common Specification for the list of valid Attributes for each Class.
You may either enter in a hexadecimal Attribute value in the (hex) field
or a decimal Attribute value in the (dec) field. Note that if the value of
the Attribute is set to 0, the DeviceNet scanner does not transmit an
Attribute byte. Some Service Codes require that a zero-value Attribute
byte be transmitted. For these Service Codes, the first byte of the Send
Data must be set to zero and the Size of Send Data (Bytes) must include
this additional byte.
Definitions for Message Status Bits on the General Tab
The table below lists the various status bits associated with the DEM
instruction as displayed in the DEM instruction setup screen.
• Abort bit AB (word 0, bit 8) lets you abort an executing DEM
instruction by setting this bit. The ER bit will be set as soon as the AB
bit is set. This bit is reset the next time the message rung goes from false
to true.
• Error bit ER (word 0, bit 12) is set when the message has failed to
complete successfully. This bit is reset the next time the message rung
goes from false to true. Do not set or reset this bit. It is informational
only.
Table 12.22 DEM Instruction Setup Screen Status Bits
Bit Definition Bit Mnemonic Bit Address
Abort AB 08
Error ER 12
Done DN 13
Enabled EN 15
Waiting for slot WS 10