Mitsubishi Electric MELSEC-Q Structured Programming Manual page 67

FXCPU Structured Programming Manual
[Device & Common]
Notation of high speed counters
For some high speed counters in FX
auxiliary relays are combined.
(For input terminal numbers, refer to Subsection 2.7.2.)
Such high speed counters are described as follows in this section. Note that "(OP)" is not available in
programming.
Standard device number
C244
C245
2) In FX /FX
3G 3GC
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.
*2. C254 is usually used as a counter having reset input and start input, but can be used as a counter
C254 (OP) not having reset input or start input when used together with special auxiliary relays M8388
and M8395.
Notation of high speed counters
For some high speed counters in FX
special 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
C254
/FX PLCs, the assignment of input terminals switches when special
3U 3UC
Switched device number
C244(OP)
C245(OP)
PLCs
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
C253(OP) 1-edge counting
*2
C254(OP)
C252
1-edge counting
C253
C254
1-edge counting
C255
/FX
3G 3GC
Switched device number
C248(OP)
C253(OP)
C254(OP)
Standard device number
C248
C253
External reset input
Data length
32-bit
bidirectional
counter
32-bit
bidirectional
counter
32-bit
bidirectional
counter
PLCs, the assignment of input terminals switches when
2 Devices in Detail
2.7 High Speed Counter [C]
Switched device number
C248(OP)
C253(OP)
External start input
terminal terminal
Not provided Not provided
Provided Not provided
Provided Provided
Not provided Not provided
Provided Not provided
Provided Provided
Not provided Not provided
Provided Not provided
Provided Provided
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