User`s guide

Page 45

Controlinc 1746-C (Version 5.21) Network Master Users Guide (2004-11-18)

Words [15

 16]: FUNCTION: Reset Scan Period Counter (Accumulator)

This operation allows the operator the chance to reset the scan period counter/accumulator

• When desired … word [15] =/= 0.

• With the value desired … word [16] value.

The scan period counter is located in table [0] – words [47 & 48] such that

• Word [47] … Rollover counter for the Scan Period Counter.

• Word [48] … Scan Period Counter

Both have a high end max value of 32,000.

Word [48] is incremented at the start of scan #1(after the previous diagnostic scan).

Whenever word [48] rolls over,

• Word [48] is automatically filled with the value in word [16].

• Word [47] is incremented

If the counter is reset in the middle of a scan period (which is most likely), it must wait until after

that scan period is finished (and the accompanying diagnostic scan) before it starts counting

again.

Note: that to determine the time for the rollover counter to rollover one time …

Rollover increment time = (time for the scan period) + (diagnostic scan time)

FORMAT:

Word [15] … This is a flag that indicates whether or not to reset the Scan Period Counter.

Word [16] … The value used to reset the Scan Period Counter.

• If Word [15] == 0 do not reset the counter.

• If Word [15] =/= 0 (any non-zero value) …

• Word [47] = 0

• Word [48]    Word [16]

By default, Words [15 & 16] == 0 … do not reset the counter.