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IM34M06H54-01E-006
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Resetting A Counter
Resetting a counter returns its value to zero. A counter can be reset using output relays or
it may reset automatically when the counter value exceeds its maximum set value.
(1) Resetting a counter using output relays
Turning on output relay Y
36, Y
40, Y
44 or Y
48 (
indicates the slot number where the module is installed) resets the counter for
channels 1 to 4 respectively.
(2) When the counter value of a ring-up counter exceeds its maximum value
When the counter value of a ring-up counter exceeds its maximum value, the counter
resets automatically.
Enabling and Disabling A Counter
You can continue (restart) or stop the operation of a counter.
(1) Enabling or disabling a counter using output relays
Turning off output relay Y
49, Y
53, Y
57 or Y
61 (
indicates the slot number where the module is installed) stops the counter for input
channels 1 to 4 respectively. Turning the relay on again enables the counter. After
powering on, a counter remains disabled until its corresponding output relay is turned
on.
(2) To automatically stop a counter when the counter value is reset to 0
You can set the counter of an input channel (1 to 4) to stop operation when its counter
value exceeds the maximum ring-up counter value and is reset to zero. To do so, set
bit 2 of the input function register of the input channel to 1. To restart a counter that
has stopped, turn on output relay Y
35, Y
39, Y
43, or Y
47
(
indicates the slot number where the module is installed) for input channels 1-4
respectively.
CAUTION
To restart the counter of an input channel, turn on the corresponding output relay and
confirm that the corresponding input relay X
03, X
07, X
11 or X
15
(
indicates the slot number where the module is installed) has been actually cleared
before turning off the output relay. Turning on the output relay for only one scan may fail to
clear the input relay.
CAUTION
In a multi-CPU configuration, be sure to set the slot where the module is installed to “not
used” in the configuration of CPUs not using the module. Otherwise, the counters may fail
to operate correctly.
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