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11 Use of High-speed Counters
11.4 Allocation of Device Numbers to Input Numbers
162
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
11.4 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.
11.4.1 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 11.9.2.
11.4.2 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,
ZRN and DSZR instructions and general-purpose inputs. Take care not to overlap the input numbers.
Counter type 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
C254(OP)*1
A B
C255
A B R S