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Mitsubishi Electronics FX3G User Manual

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108
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.7 High-Speed Counter [C] (FX3S/FX3G/FX3GC PLCs)
5. High-speed counter device list
*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.
→ For the method to switch the counter function, refer to Subsection 4.7.6.
*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.
This function is supported only in FX
3G
/FX
3GC
 PLCs.
→ For the method to switch the counter function, refer to Subsection 4.7.6.
Notation of high-speed counter devices
In some high-speed counters in FX
3S
/FX
3G
/FX
3GC
 PLCs, the input terminal assignment is changed over when used 
together with special auxiliary relays.
Such high-speed counter devices are classified below. Note that description as (OP) is not available in programming.
Classification
Counter No.
Data length
External reset 
input terminal
External start 
input terminal
1-phase
1-count input
C235
C236
C237
C238
C239
C240
32-bit
bi-directional 
counter
Not provided
Not provided
C241
C242
C243
Provided
Not provided
C244
C245
Provided
Provided
1-phase
2-count input
C246
C248(OP)
*1
32-bit
bi-directional 
counter
Not provided
Not provided
C247
C248
Provided
Not provided
C249
C250
Provided
Provided
2-phase
2-count input
C251
C253(OP)
*1
C254(OP)
*2
32-bit
bi-directional 
counter
Not provided
Not provided
C252
C253
Provided
Not provided
C254
C255
Provided
Provided
Standard Device Numbers
Switched Device Numbers
C248
C248(OP)
C253
C253(OP)
C254
C254(OP)