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FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
11 Use of High-speed Counters (C235 to C255)
11.5 Allocation of Device Numbers to Input Numbers
*3.
The input terminals to be used and the functions are switched by driving the special auxiliary relays in
the program.
→ For the procedures on switching to hardware counters, refer to Subsection 11.11.3.
*4.
The 2-phase 2-count input counters are 1 edge count counters. The use of special auxiliary relays
changes them to 4 edge count counters.
→ For the procedures on operating them as 4 edge count counters, refer to Subsection 11.11.4.
• The same input numbers are allocated to the input terminals on FX3U-4HSX-ADP and the input terminals
of the main unit of FX3U PLC. Use one of the terminals with the same number. If both input terminals are
being used, intended operation cannot be realized because the input terminals on FX3U-4HSX-ADP and
the main unit operate in the OR relation.
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14
Test Run,
Maintenance,
Troubleshooting
• The input terminals X000 to X007 can be used for high-speed counters, input interruption, pulse catch,
SPD, ZRN, DSZR and DVIT instructions and general-purpose inputs. Take care not to overlap the input
numbers.
For example, when C251 is used, X000 and X001 are occupied. Therefore, it is impossible to use C235,
C236, C241, C244, C246, C247, C249, C252 and C254, input interruption pointers I000 and I101, pulse
catch contacts M8170 and M8171 and SPD, ZRN, DSZR and DVIT instructions at the same time.
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Wiring for
Various Uses
11.5.2 Inhibition of redundant use of input numbers
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Output Wiring
When the comparison set/reset instructions (DHSCS, DHSCR, DHSZ and DHSCT) for high-speed
counters are used, the hardware (H/W) counters are switched to software (S/W) counters.
When the input signal logic is inverted by the reset input signal logic switching function (M8388 and
M8389), C253 is switched from a hardware counter to a software counter.
→ For the conditions under which it is handled as a software counter, refer to Section 11.8.
High-Speed
Counters
*2.
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IInput/Output
Powered
Extension Units
16
Input/Output
Extension
Blocks
17
Extension
Power Supply
Unit
18
Other Extension
Units and
Options
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Display Module
20
Terminal Block
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