Chapter 4 Relay Ladder Logic Programming 55
High Speed Counters (DC Version Only)
The DC powered version smart relays include two 1 KHz high speed inputs on terminal I1 and I2. These can be
used as general purpose DC inputs or can be wired to a high speed input device (encoder, etc.) when configured for
high speed counting. These are often used for counting something moving very fast (>40Hz) or used as a speed
reference on a machine. The high speed counters are configured using the same software Edit Contact/Coil dialog
box, except selecting Counter Mode 7 or Mode 8.
High Speed Counter Mode 7 (DC powered versions only)
The Mode 7 High Speed Counter can use either input
terminals I1 or I2 for forward up-counting to 1Khz maximum at
24VDC high speed input signal. The selected Counter Coil
(C1-CF) will turn ON when the pulse count reaches the target
setpoint and remain ON. The counter will reset when the
preceding rung is inactive or the Reset Input is active.
Symbol
Description
c
Counting Mode (7) high speed counting
d
High speed counting input terminal: I1 or I2 only
e
Use (I1 ~ gF) to RESET the counting value
ON: the counter reset to zero
OFF: the counter continues to count
f
Current Count Value, range:0~999999
g
Preset Value, range:0~999999
h
Counter Coil Number (C1 ~ CF total: 15 counters)
In the example below shows the relationship between the
numbered block diagram for a Mode 7 Counter, the ladder
diagram view, and the software Edit Contact/Coil dialog box.
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