Change Of Logic Of External Reset Input Signal - Mitsubishi Electric MELSEC-Q Structured Programming Manual

FXCPU Structured Programming Manual
[Device & Common]
4. Operation status of hardware counters and software counters
FX /FX /FX /FX
0S 0 0N
function.
Device number
*1
M8380
*1
M8381
*1
M8382
*1
M8383
*1
M8384
*1
M8385
*1
M8386
*1
M8387
*1. Cleared when the PLC mode switches from STOP to RUN.
2.7.6

Change of logic of external reset input signal

Counters C241 to C245, C247 to C250 and C252 to C255 are usually reset when the external reset input
signal turns ON.
By using the program shown below, the logic can be reversed so that these counters are reset when the
external reset input signal turns OFF.
FX /FX /FX /FX
0S 0 0N
function.
Counter No.
C241 to C245
C247 to C250
C252 to C255
Caution
When the logic of the external reset input signal is reversed, C253 switches to a software counter.
/FX /FX /FX /FX
1S 1N 1NC U
Name
Indicates the operation status of C235, C241, C244,
C246, C247, C249, C251, C252 and C254.
Indicates the operation status of C236.
Indicates the operation status of C237, C242 and C245.
Indicates the operation status of C238, C248, C248
Operation status
(OP), C250, C253 and C255.
Indicates the operation status of C239 and C243.
Indicates the operation status of C240.
Indicates the operation status of C244 (OP).
Indicates the operation status of C245 (OP).
/FX /FX /FX /FX
1S 1N 1NC U
Program to reverse logic of external reset input signal
M8388
M8389
EN
CCoil
CC2
K
CValue
/FX /FX /FX /FX
2C 2N 2NC 3S 3G
Description
/FX /FX /FX /FX
2C 2N 2NC 3S 3G
The logic of the external reset input signal is reversed
so that the counters are reset when the external reset
OUT_C_32
input signal turns OFF.
ENO
(The logic is reversed for all target counters.)
2 Devices in Detail
2.7 High Speed Counter [C]
/FX PLCs do not support this
3GC
ON OFF
Software counter Hardware counter
/FX PLCs do not support this
3GC
Description
1
2
3
4
5
6
7
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