Assignment Of Counter Input Terminal And Switching Of Function - Mitsubishi Electric FX3G SERIES Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. Devices used to check the counting direction of 1-phase 2-count input counters and
2-phase 2-count input counters
Type
1-phase
2-counting input
2-phase
2-counting input
3. Devices used to switch the high-speed counter function
Device No.
Contact for changing function of
M8388
high-speed counter
M8392
Function switching
device
M8395
4.8.6

Assignment of counter input terminal and switching of function

When the counters C248, C253 and C254 are combined with the following special auxiliary relays, the allocation of the
input terminals and functions are changed.
In a program, put a special auxiliary relay just before a target counter.
Counter No.
C248(OP)
C253(OP)
C254(OP)
Counter No. Monitoring device
C246 M8246
C247 M8247
C248 M8248
C249 M8249
C250 M8250
C251 M8251
C252 M8252
C253 M8253
C254 M8254
C255 M8255
Name
Changes the function of high-speed counter.
Switches the function of C248 and C253.
(For details, refer to Subsection 4.8.6.)
Switches the function of C254. (For details, refer to Subsection 4.8.6.)
When using assignment of counter input terminal and
switching of function
M8388
M8392
C248
K
M8388
M8392
C253
K
M8388
M8395
C254
K
4.8 High-Speed Counter [C] (FX3G PLCs)
OFF ON
Up-counting Down-counting
Description
Description
• Reset input is not provided.
• Reset input is not provided.
• The input count (2-phase 2-count) changes
as follows:
Phase A: Changes from X000 to X006.
Phase B: Changes from X001 to X007.
• Reset input is not provided.
• Start input is not provided.
4 Devices in Detail
1
2
3
4
5
6
7
8
9
10
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