Installation manual

Publication 1747-RM001G-EN-P - November 2008
SLC Communication Instructions 12-49
• 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.
• Done bit DN (word 0, bit 13) is set when the message has completed
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.
• Enabled bit EN (word 0, bit 15) is set after the message rung goes from
false to true AND the scanner module accepts this message because it is
not currently processing any other explicit messages. (The scanner
module can process only one CEM instruction at a time.) If the message
rung goes false before the scanner module accepts this message, then
the enable bit will remain off and the message will not be executed. This
bit is reset when the message has completed with either the Done bit set
or the Error bit set and the message rung goes false. If the message rung
conditions remain true, you may retrigger the message instruction by
resetting this bit after either the ER or DN bit has been set, indicating
that the previous execution has completed.
• Waiting for Slot bit WS (word 0, bit 10) is set when the message rung
goes from false to true, but the scanner module is still processing
another CEM instruction. In order to ensure that this message gets
processed, you must leave the message rung conditions true until the
WS bit is reset and the EN bit is set, indicating that the scanner module
has accepted this message for processing. Do not set or reset this bit. It
is informational only.
Scanner Status, Error, and Error Description on the General Tab
The Scanner Code displays the explicit message status returned by the scanner
module. A scanner code of 0 means no errors. Table 12.19 lists other valid
scanner codes.
Table 12.19 CEM Instruction Scanner Codes
Scanner Code Description of Scanner Status
201H Invalid command data size
202H Internal fault detected
204H Invalid service code
205H Invalid IOI size
206H Invalid CIP request block contents
207H CIP message request timeout
208H CIP timeout value too small