Mitsubishi Electric MELSEC-Q Structured Programming Manual page 68

FXCPU Structured Programming Manual
[Device & Common]
3) In FX PLC
3S
Classification
Software
counters
Software
counters
Software
counters
*1. C248 and C253 are usually used as counters having reset input, but can be used as counters C248
(OP) and C253 (OP) not having reset input when used together with special auxiliary relays M8388
and M8392.
Notation of high speed counters
For some high speed counters in FX
auxiliary relays are combined.
Such high speed counters are described as follows in this section. Note that "(OP)" is not available in
programming.
Standard device number
C248
C253
66
1-edge counting/
Counter No.
4-edge counting
C235
C236
C237
-
C238
C239
C240
C241
C242 -
C243
C244
-
C245
C246
-
*1
C248(OP)
C247
-
C248
C249
-
C250
C251
1-edge counting
*1
C253(OP)
C252
1-edge counting
C253
C254
1-edge counting
C255
PLC, the assignment of input terminals switches when special
3S
Switched device number
C248(OP)
C253(OP)
External reset input
Data length
terminal
Not provided
32-bit
bidirectional
counter
Provided
Provided
Not provided
32-bit
Provided
bidirectional
counter
Provided
Not provided
32-bit
Provided
bidirectional
counter
Provided
2 Devices in Detail
2.7 High Speed Counter [C]
External start input
terminal
Not provided
Not provided
Provided
Not provided
Not provided
Provided
Not provided
Not provided
Provided