FX Series Programmable Controllers | Devices in Detail 4 |
4.11.2Availability of High Speed Counters
The following device table outlines the range of available high speed counters.
FX1S | FX1N | FX2N | FX2NC |
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| I |
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| 1 Phase counter |
| 1 Phase counter |
| 2 Phase counter |
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| N |
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| assigned |
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| A/B Phase counter |
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| user start/reset |
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| P |
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| start/reset |
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| U |
| C235 | C236 | C237 | C238 | C239 | C240 | C241 | C242 | C243 | C244 | C245 |
| C246 | C247 | C248 | C249 |
| C250 | C251 | C252 | C253 | C254 | C255 |
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| T |
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| X0 |
| U/D |
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| U/D |
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| U/D |
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| U | U |
| U |
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| A | A |
| A |
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| X1 |
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| U/D |
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| R |
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| R |
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| D | D |
| D |
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| B | B |
| B |
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| X2 |
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| U/D |
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| U/D |
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| U/D |
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| R |
| R |
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| R |
| R |
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| X3 |
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| U/D |
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| R |
| S | R |
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| U |
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| U |
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| A |
| A |
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| X4 |
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| U/D |
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| U/D |
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| D |
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| D |
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| B |
| B |
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| X5 |
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| U/D |
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| R |
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| R |
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| R |
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| R |
| R |
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| X6 |
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| S |
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| S |
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| S |
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| X7 |
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| S |
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| S |
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| S |
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Key:
C235
U - up counter input | D - down counter input |
R - reset counter (input) | S - start counter (input) |
A - A phase counter input | B - B phase counter input |
- Counter is backed up/latched |
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Input assignment:
• X6 and X7 are also high speed inputs, but function only as start signals. They cannot be used as the counted inputs for high speed counters.
•Different types of counters can be used at the same time but their inputs must not coincide. For example, if counter C247 is used, then the following counters and instructions cannot be used;
C235, C236, C237, C241, C242, C244, C245, C246, C249, C251, C252, C254, I0❏❏, I1❏❏, I2❏❏.
Counter Speeds:
•General counting frequencies:
-Single phase and
-A/B phase counters; up to 5 kHz.
-Maximum total counting frequency (A/B phase counter count twice) FX1S & FX1N 60kHz, FX2N & FX2NC 20kHZ.
•For FX2N & FX2NC Inputs X0 and X1 are equipped with special hardware that allows
higher speed counting as follows:
-Single phase or
-Two phase counting with C251; up to 30 kHz.