Allocation Of Device Numbers To Input Numbers; Allocation Table; Restriction Of Redundant Use Of Input Numbers - Mitsubishi FX3G SERIES User Manual

FX Series Programmable Controllers
3G
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
R: External reset input
Counter type
1-phase 1-count
input
1-phase 2-count
input
2-phase 2-count
input
*1. When a special auxiliary relay is driven in a program, the input terminals and their associated
functions are switched.

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.
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 and DSZR instructions at the same time.
132
D: Down-count input
S: External start input
Counter No.
X000 X001
C235 U/D
C236 U/D
C237
C238
C239
C240
C241 U/D
C242
C243
C244 U/D
C245
C246 U
C247 U
C248
*1
C248(OP)
C249 U
C250
C251 A
C252 A
C253
*1
C253(OP)
C254 A
C254(OP)*1
C255
→ For the function switching method, refer to Subsection 11.8.2.
11.4 Allocation of Device Numbers to Input Numbers
A: A-phase input
Input allocation
X002 X003 X004
U/D
U/D
U/D
R
U/D R
U/D
R
U/D R
D
D R
U D
U D
D R
U D
B
B R
A B
A B
B R
A B
11 Use of High-speed Counters
B: B-phase input
X005 X006 X007
U/D
R
S
S
R
S
R S
R
S
A B
R S