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10 Use of High-speed Counters
88
FX3S Series Programmable Controllers
User's Manual - Hardware Edition
10.4 Allocation of Device Numbers to Input Numbers
10.4 Allocation of Device Numbers to Input Numbers
The high-speed counter numbers are allocated to the input terminals X000 to X007 as shown in the following
table. The input terminals not allocated for high-speed counters can be used as general input terminals.
10.4.1 Allocation table
U: Up-count input D: Down-count input A: A-phase input B: B-phase input
R: External reset input S: External start input
*1. When a special auxiliary relay is driven in a program, the input terminals and their associated
functions are switched.
For the function switching method, refer to Subsection 10.9.2.
10.4.2 Restriction of redundant use of input numbers
The input terminals X000 to X007 can be used for high-speed counters, input interruption, pulse catch, SPD
instruction, ZRN instruction and DSZR instruction and general-purpose inputs.
Take care not to overlap the input numbers.
High-speed counter type High-speed counter No.
Input allocation
X000 X001 X002 X003 X004 X005 X006 X007
1-phase 1-count input
C235 U/D
C236 U/D
C237 U/D
C238 U/D
C239 U/D
C240 U/D
C241 U/D R
C242 U/D R
C243 U/D R
C244 U/D R S
C245 U/D R S
1-phase 2-count input
C246 U D
C247 U D R
C248 U D R
C248 (OP)
*1
U D
C249 U D R S
C250 U D R S
2-phase 2-count input
C251 A B
C252 A B R
C253 A B R
C253 (OP)
*1
A B
C254 A B R S
C255 A B R S