Chapter 2 Basic Unit Specification
4. High speed input
2-26
4.3 Function
The high speed counter operates differently if the input is not same. Refer to the former table for
fore information about the operation. The Set and Reset of the high speed counter, having nothing
to do with PLC scan time, is controlled by interruption pointer.
Such counter (32bit, up counting/ down counting, HEX) can be classified into three types
according to different switching of the up and down counting.
Item
1phase 1 input
counting
1phase 2 inputs
counting
2phases 2 inputs counting
Counting direction,
up/down
C235~C245
counting direction is
controlled by
M8235~M8245 ON
/OFF.
Automatically
controlled by the
different inputs.
A phase is ON, and at the
same time, B phase is
OFF—ON: up counting;
B phase is ON—OFF:
down counting.
Supervision counting
direction
——
Supervise M8246~M8255 to show counting
direction.
In terms of all kinds of high speed counter, the reset and set is controlled by interruption pointer.
Information on M8xxx controlling counting
direction
Information on M8xxx supervising counting
direction
Type Counter M8xxx relay Type Counter M8xxx relay
C235 M8235 C246 M8246
C236 M8236 C247 M8247
C237 M8237 C248 M8248
C238 M8238 C249 M8249
C239 M8239
1phase
2input
C240 M8240 C251 M8251
C241 M8241 C252 M8252
C242 M8242 C253 M8253
C243 M8243 C254 M8254
C244 M8244
2phase
2input
ON : indicating
DOWN counting
(DN)
OFF: indicating
UP counting
(UP)
1phase
1input
C245 M8245
ON : operating
DOWN counting
(DN)
OFF: operating
UP counting
(UP)
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