Laurel Electronics LTM CTR SERIES PULSE, AC or PROCESS TOTALIZER INPUT, SERIAL DATA OUTPUT - Manual (Page 19)

- - 19 -
• Rates A+B, A-B, AxB, A-B, A/B, A/B-1 (Extended counter) can output arithmetic combi-
nations of Rates A and B (Item #1), Rate A (Item #2), or Rate B (Item #3). With rates A and
B scaled to produce a ratio close to 1 and an offset of -1, the special combination A/B-1,
called “Draw,” can output percentage changes, such as elongation of material as it passes
between rollers.
PERIOD MODES
The inverse of frequency. Normally expressed in seconds.
TOTAL MODES
•
Total A, B determines Total independently for Channel A (Item #1) and Channel B (Item #2).
Either item can be selected for the analog output.
• Total A Only determines Total only for Channel A (Item #1). Channel B is not used.
• Total Burst (Extended counter) determines the total number of signal bursts applied to
Channel A (Item #1) and signal frequency within a burst (Item #2). Gate time must be
greater than the period of the lowest signal frequency and less than the minimum time
between bursts. Time Out must be greater than the maximum time between bursts.
• Total B, A Rate (Extended counter) determines Total for Channel B (Item #1) and Rate for
Channel A (Item #2).
• Total A, B UpDnCtl (Extended counter) determines Total A (Item #1), where the up or down
count direction is determined by an input on Channel B. If the menu item SLOPE is set to 0
for Channel B, an input level on B below the jumper set Low Threshold B causes the count to
go up, and an input level above the jumper set High Threshold causes the count to go down.
If SLOPE for Channel B is set to 1, the opposite occurs. The maximum frequency on A that
can be counted is 250 kHz, or a minimum of 4 µs between pulses.
• Total A, B InhibitCtl (Extended counter) determines Total A (Item #1), where counting may
be inhibited by a control input on Channel B. If the menu item SLOPE is set to 0 for Channel
B, a low input level on B allows counting, and a high input level inhibits counting. If the
SLOPE for Channel B is set to 1, the opposite occurs. The maximum frequency on A that can
be counted is 1 MHz.
• Totals A+B, A-B, AxB, A/B, A/B-1 (Extended counter) determine arithmetic combinations of
Totals A and B (Item #1). Total A (Item #2) and Total B (Item #3) are also tracked and can
be selected for analog ouput.
TIMING MODES
•
Time Interval A to B determines the time between periodic inputs on Channels A and B.
Timing starts when a pulse is applied to Channel A (positive edge if slope A is 0, negative
edge if slope A is 1), and ends when a pulse is applied to Channel B (positive edge if slope B
is 0, negative edge if slope B is 1). Pulse width may be measured by tying inputs A and B