GFK-1504K Chapter 13 Mixed Discrete/High-speed Counter Module 13-11
13
IC200MDD841
Mixed Module, 24VDC Positive Logic Input 20 Points / Output 12 Point /
(4) High Speed Counter, PWM, or Pulse Train Configurable Points
The Count Pulse input increments or decrements the counter’s accumulator. The count
input can be configured to be positive or negative edge-sensitive.
The Preload/Strobe Input can either preload a value into the accumulator or strobe the
accumulator value into a register. Preload/Strobe signals are always positive edge-
sensitive.
The Preload register contains a predefined value to be transferred to the Accumulator
when the Preload/Strobe signal is active. The module sets the Preload flag bit when a
Preload occurs. The CPU can clear the flag before the next preload. The Preload input
always loads the Accumulator regardless of the state of the Preload flag. The Preload
register can be configured to any value within the counter’s range.
If Strobe is selected, the Accumulator value is placed in the Strobe register when the
Preload/Strobe signal is active. The module sets a Strobe flag when a strobe occurs. The
PLC or computer can clear this flag before the next strobe. The Strobe input always loads the
Strobe register with the Accumulator value regardless of the state of the Strobe flag. Strobe
Inputs can be used as Pulse Capture Inputs by using the Strobe status bits as a latch.
The Accumulator register contains the current count. It can be set to a value supplied by
the PLC or computer. The PLC/computer can also send an adjustment value to the
Accumulator register. The adjustment value can be between -128 and +127.
The Counts-per-Timebase register contains the number of counts that occurred during the
last-completed timebase interval. The number of counts is a 16-bit signed number. The
sign indicates up (+) or down (-) counts. The range of the Counts/Timebase register is –
32768 and +32767 counts.
The Timebase is a span of time used to measure the rate of counting. For example, the
program could monitor the number of counts that occur in 30 seconds. Timebase is
configurable in 10mS increments from 10mS to 65530mS. If the timebase is too large, the
Counts/Timebase register will lose the overflow values.
The On/Off Preset values determine when the counter output is activated or deactivated.
The Output can be activated based on configured On and Off Preset values.
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