2. Programming Concepts
MN05003003E For more information visit: www.eaton.com
2-55
input terminal to execute add 1 (count up) or subtract 1 (count down) when X21=on.
When counter C251 attains settings K5, C251 contact will be ON. After C251 is ON, if there is
counter pulse input, C251 will keep on counting.
In ELC-PB, ELCB-PB and ELC-PC/PA/PH controllers frequency can be set to normal, double
frequency or four times frequency by D1022 (counting mode setting). Factory setting is double
frequency.
C251 in ELC-PV controllers has external input signals to reset X2 and start X3.
The counting modes (normal frequency, double frequency, triple frequency or 4 times frequency) of
C251 (HHSC0) in ELC-PV controllers can be set up by D1225. The default setting is double
frequency mode.
The external input contact of reset signal of C246 (HHSC0) in ELC-PV controllers is disabled by
M1264. The external input contact of start signal is disabled by M1265.
The internal input contact of reset signal of C246 (HHSC0) in ELC-PV controllers is disabled by
M1272. The internal input contact of start signal is disabled by M1273.
ELC-PB/PC/PA/PH, ELCB-PB controllers (Double frequency):
0
1
2
3
4
5
X21
X20
6
3
0
1
2
3
4
5
A-phase X0
B-phase X1
C251 present value
Y0, C251 contact
Counting up
Counting down
ELC-PV controllers (Double frequency):
0
1
2
3
4
5
X21
X20
6
2
0
1
2
3
4
5
A-phase X0
B-phase X1
C251 present value
Y0, C251 contact
Counting up
Counting down
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