Omron CJ1W-CT021 Operation Manual page 84

Digital Input Functions
Enable, Disable Reset
External Reset
Disabled
Digital Input Status
General Setting:
n+16
Action Status
Z-Input Status
64
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.
Function 15:
Enable Reset
External Reset
External Reset
Disabled
Enabled
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 3-6 "Reset
Signals" for detailed information about resetting Counters.
The status of the two Digital Inputs is reflected by their corresponding bits in CIO.
You can use these bits as event flags in the Ladder Program.
15 14 13 12 11 10 9
Bits 0 and 1 correspond to the Physical Digital Inputs I0 and I1.
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 or shorter than the time the Data Transfer Busy bit is ON for IOWR-instruc-
tion execution), may not be seen in the Digital Status Word.
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.
For each counter the Z-input status is reflected in CIO. The bit is ON for ecactly
one PLC-cycle-time after the Z-input has been activated.
External Reset
Enabled
8 7 6 5 4 3 2 1
I1 I0
Function 16:
Disable Reset
External Reset
External Reset
Enabled
Disabled
0
Digital Input Status:
0 = Input is OFF
1 = Input is ON
Section 3-4