Input Assignment For High-Speed Counters - Mitsubishi FX3G Series Programming Manual

FX /FX /FX /FX
3G 3U 3GC 3UC
Programming Manual - Basic & Applied Instruction Edition
4.8.2

Input assignment for high-speed counters

Inputs X000 to X007 are assigned as shown in the table below according to each high-speed counter number.
When a high-speed counter is used, the filter constant of a corresponding input number in the main unit automatically
changes (X000, X001, X003 and X004: 10 µs, X002, X005, X006 and X007: 50 µs). Input terminals not used for high-
speed counters, however, can be used as general inputs.
Counter No.
1-phase
1-count
input
1-phase
2-count
C248(OP)
input
2-phase
2-count C253(OP)
input
C254(OP)
U: Up-counting input
B: B phase input
Restriction to overlap input numbers
• Inputs X000 to X007 are used for high-speed counters, input interrupt, pulse catch, SPD/ZRN/DSZR instructions
and general-purpose inputs. When assigning functions, there should be no overlap between those input terminals.
For example, when C251 is used, X000 and X001 are occupied. As a result, "C235, C236, C241, C244, C246,
C247, C249, C252 and C254", "input interrupt pointers I000 and I101", "pulse catch contacts M8170 and M8171"
and "SPD, ZRN and DSZR instructions using X000 and/or X001" cannot be used.
118
Series
→ For the input specifications of the main unit, refer to the Hardware Edition of the main unit.
X000 X001
C235 U/D
C236
U/D
C237
C238
C239
C240
C241 U/D R
C242
C243
C244
U/D R
C245
C246 U D
C247 U D
C248
C249 U D
C250
C251 A B
C252 A B
C253
C254 A B
C255
D: Down-counting input
R: External reset input
4.8 High-Speed Counter [C] (FX3G/FX3GC PLCs)
Input terminal assignment
X002 X003 X004 X005
U/D
U/D
U/D
U/D R
U/D
U/D R
R
U D
U D
R
U D
R
A B
A B
R
A B
A: A phase input
S: External start input
4 Devices in Detail
X006 X007
U/D
R
S
S
R
S
R S
R
S
A B
R S