Mitsubishi FX3UC Series, Руководство пользователя

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152
FX
3UC
Series Programmable Controllers
User’s Manual - Hardware Edition
5 Input Specifications and External wiring
5.5 High-speed Counters (C235 to C255)
5. The device list of the high speed counter
*1. These counters are handled as software counters depending on the operating condition. When they
are handled as software counters, they have limitations on maximum response frequency and overall
frequency.
→
For the conditions under which they are handled as software counters,
refer to Subsection 5.5.8.
→
For the overall frequency, refer to Subsection 5.5.9.
*2. When the input terminals of the main unit receive pulses having a response frequency of 50k to
100kHz, wire the terminals as stated below.
-
The wiring length should be 5m (16’4") or less.
- Connect a bleeder resistance of 1.5k
Ω
(1W or more) to the input terminal, so that the load current
of the open collector transistor output on the mating device side is 20mA or more.
→
For the wiring, refer to Section 7.3.
*3. C244, C245 and C248 are usually used as software counters. When they are used in combination
with special auxiliary relays (M8388 and M8390 to M8392), they can be used as hardware counters
C244(OP), C245(OP) and C248(OP).
→
For the procedures on switching the counter function, refer to Subsection 5.5.6.
*4. The 2-phase 2-input counters are 1 edge count counters. When they are used in combination with
special auxiliary relays (M8388, M8198 and M8199), they can be used as 4 edge count counters.
→
For the procedures on using them as 4 edge count counters, refer to Subsection 5.5.7.
Counter
type
Classification
Device No.
(counter)
1 edge count/
4 edge count
Data length
External reset
input terminal External start
input terminal
1-phase
1-count
input
Hardware
counter
*1
C235
*2
C236
*2
C237
*2
C238
*2
C239
*2
C240
*2
−
32-bit
bi-directional
counter
None None
C244(OP)
*3
C245(OP)
*3
−
Software
counter
C241
C242
C243
−
Provided
*5
None
C244
*3
C245
*3
−
Provided
*5
Provided
1-phase
2-count
input
Hardware
counter
*1
C246
*2
C248(OP)
*2*3
−
32-bit
bi-directional
counter
None None
Software
counter
C247
C248
*3
−
Provided
*5
None
C249
C250
−
Provided
*5
Provided
2-phase
2-count
input
Hardware
counter
*1
C251
*2
1 edge count
*4
32-bit
bi-directional
counter
None
None
4 edge count
*4
C253
*2
1 edge count
*4
Provided
*5
4 edge count
*4
Software
counter
C252
1 edge count
*4
Provided
*5
None
4 edge count
*4
C253(OP)
*6
1 edge count
*4
None
4 edge count
*4
C254
C255
1 edge count
*4
Provided
*5
Provided
4 edge count
*4