2. Programming Concepts
MN05003003E For more information visit: www.eaton.com
2-51
Applicable Hardware High Speed Counters:
1-phase input 1-phase 2-input 2-phase 2-input
C
X
C243 C244 C245 C246 C247 C248 C249 C250 C251 C252 C253 C254
X0 U U/D U/D U U A A
X1 R Dir Dir D D B B
X2 U U/D U/D A A
X3 R Dir Dir B B
X4 R R R
X5 R R
Maximum Count Frequency for each counter (Unit: kHz)
ELCM 100 100 100 100 10 10 100 100 5 5 5 5
U: Count up A: Phase A input Dir: Direction signal input
D: Count down B: Phase B input R: Reset signal input
Note:
1. The max. frequency of the 1-phase input X0 (C243, C245, C246) and X2(C244) is 100kHz.
2. The max. frequency of the 1-phase 2-input (X0, X1)(C245, C246) and (X2, X3)(C249, C250)
is 100kHz.
3. The max. frequency of the 1-phase 2-input (X0, X1)(C247, C248) is 10kHz.
4. The max. frequency of the 2-phase 2-input (X0, X1)(C251, C252) and (X2, X3)(C253, C254)
is 5kHz.
5. 2-phase 2-input counting supports double and 4 times frequency, which is selected in D1022
as the table in next page. Please refer to the below table for detailed counting wave form.
D1022 Counting mode
K2
(Double Frequency)
A
B
u
p
c
o
u
n
t
d
o
w
n
c
o
u
n
t
A
B
u
p
c
o
u
n
t
d
o
w
n
c
o
u
n
t
K4 or other value
(4 times frequency)
(Default)
A
B
u
p
c
o
u
n
t
d
o
w
n
c
o
u
n
t
A
B
u
p
c
o
u
n
t
d
o
w
n
c
o
u
n
t
6. C243 and C244 support count-up mode only and occupy the associate input points X1 and
X3 as reset (“R”) function. If users do not need to apply reset function, set ON the associated
special M relays (M1243 and M1244) to disable the reset function.
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