Installation manual

Publication 1747-RM001G-EN-P - November 2008
Application Specific Instructions 7-13
• Control is a control file address. The status bits, length value, and
position value are stored in this element. Do not use the control file
address for any other instruction.
The control element is shown below.
Status bits of the control structure include:
– Error Bit ER (bit 11) is set when the processor detects a negative
position value, or a negative or zero length value.
– For SLC processors, this results in a major error if not cleared before
the END or TND instruction is executed.
– Done Bit DN (bit 13) is set after the instruction has operated on the
last word in the sequencer load file. It is reset on the next
false-to-true rung transition after the rung goes false.
– Enable Bit EN (bit 15) is set on a false-to-true transition of the SQL
rung and reset on a true-to-false transition.
Table 7.5 Control File Structure
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Word 0 EN DN ER Not Used
Word 1 Length
Word 2 Position