Mitsubishi Electric MELSEC-Q Structured Programming Manual page 72

FXCPU Structured Programming Manual
[Device & Common]
1. In FX /FX
3U 3UC
When FX -4HSX-ADP units are connected to an FX
3U
table below are assigned to the first FX
second FX -4HSX-ADP unit.
3U
Same input numbers are assigned to input terminals of the FX
PLC main unit. Use only either input terminal.
If both input terminals are used, intended operations are not achieved because inputs of the FX
and inputs of the FX
→ For the input specifications of the FX
1-phase
1-counting
input
1-phase
2-counting
input
2-phase
2-counting
input
H/W : Hardware counters
A : Phase A input
*1. Cautions on wiring should be considered for these high speed counters.
*2. Hardware counters are switched to software counters when a comparison set/reset instruction for high
speed counter (DHSCS, DHSCR, DHSZ or DHSCT) is used.
C253 is switched to a software counter when the logic for external reset input is reversed.
→ For the condition under which hardware counters are handled as software counters, refer to
*3. When a special auxiliary relay is driven in a program, used input terminals and their functions are
switched.
→ For the method to use software counters as hardware counters, refer to Subsection 2.7.7.
*4. 2-phase 2-input counters usually execute 1-edge counting, but can be used for 4-edge counting by
combining special auxiliary relays.
→ For the method to use a 2-phase 2-input counter for 4-edge counting, refer to Subsection 2.7.8.
70
PLCs
PLC operate under the "OR" relationship.
3U
Counter No. Classification
*1 *2
C235 H/W
*1 *2
C236 H/W
*1 *2
C237 H/W
*1 *2
C238 H/W
*1 *2
C239 H/W
*1 *2
C240 H/W
C241 S/W
C242 S/W
C243 S/W
C244 S/W
*3 *2
C244(OP) H/W
C245 S/W
*3 *2
C245(OP) H/W
*1 *2
C246 H/W
C247 S/W
C248 S/W
*1*3 *2
C248(OP) H/W
C249 S/W
C250 S/W
*1 *2
C251 H/W
C252 S/W
*1 *2
C253 H/W
*3 S/W
C253(OP)
C254 S/W
C255 S/W
S/W : Software counters
B : Phase B input
→ For the wiring, refer to the hardware manual of the PLC main unit.
PLC, input terminals inside heavy-line frames in the
3U
-4HSX-ADP unit, and other input terminals are assigned to the
3U
-4HSX-ADP and input terminals of the FX
3U
-4HSX-ADP, refer to the FX
3U
Input terminal assignment
X000 X001 X002
U/D
U/D
U/D
U/D R
U/D
U/D R
U/D
U D
U D R
U D R
A B
A B R
A B R
U : Up-counting input
R : External reset input S : External start input
2 Devices in Detail
2.7 High Speed Counter [C]
hardware manual.
3U
X003 X004 X005 X006
U/D
U/D
U/D
R
U/D R
S
U/D
R
U D R
U D
S
U D R
A B R
A B
S
A B R
D : Down-counting input
Subsection 2.7.9.
3U
-4HSXADP
3U
X007
S
U/D
S
S