E(2('%<-@*4&'-,&*$'()*+
Section 3-4
)'
Enable, Disable Reset
A Digital Input configured to have Enable Reset Functionality (Function 15) or Dis-
able Reset Functionality (Function 16) can be used to Enable/Disable resetting a
Counter by an external reset signal. The external reset signal can originate from
another Digital Input that is configured to have reset functionality (Function 5, 6,
11, 12, 13 or 14) or from the Z-input.
In order to be able to reset a Counter with Function 5, 6, 11, 12, 13 or 14, resetting
must be Enabled by setting the Software Enable Reset Bit. Refer to
for detailed information about resetting Counters.
Digital Input Status
The status of the four Digital Inputs is reflected by their corresponding bits in CIO.
You can use these bits as event flags in the Ladder Program.
The above-mentioned Digital Input Status Word reflects the status of all Digital
Inputs. However, very short pulses on the Digital Inputs (shorter than the PLC-
cycle), may not be seen in the Digital Status Word.
Action Status
The Preset, Reset and Capture actions can be detected via CIO. Each action has
a corresponding bit which is ON for exactly one PLC-cycle-time after the occur-
rence of that action. You can use these bits in the Ladder Program to take the
appropriate action.
Z-Input Status
For each counter the Z-input status is reflected in CIO. The bit is ON for exactly
one PLC-cycle-time after the Z-input has been activated.
Function 15:
Enable Reset
Function 16:
Disable Reset
External Reset
Disabled
External Reset
Disabled
External Reset
Disabled
External Reset
Enabled
External Reset
Enabled
External Reset
Enabled
General Setting:
n+16
I3 I2 I1 I0
Digital Input Status:
0 = Input is OFF
1 = Input is ON
Bits 0, 1, 2 and 3 correspond to the Physical Digital Inputs I0, I1, I2 and I3.
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
W902-E2-03.book Seite 64 Donnerstag, 7. Oktober 2004 2:06 14
Summary of Contents for CS1W-CT021
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