Omron DEVICENET#05-2003 Operation Manual page 190

GT1-CT01 Counter Unit
Reset mode
1 Encoder input Z
2 External input
3 Encoder input Z + exter-
nal input
4 Internal Reset Bit
5 Encoder input Z + inter-
nal Reset Bit
6 External output + inter-
nal Reset Bit
7 Encoder input Z + exter-
nal input + internal Reset
Bit
180
The possible combinations (reset modes) are shown in the following table.
Input
Encoder input Z
Reset
External input
Reset
Encoder input Z
External input
Reset
Internal Reset Bit
Reset
Encoder input Z
Internal Reset Bit
Reset
External output
Internal Reset Bit
Reset
Encoder input Z
External input
Internal Reset Bit
Reset
Note 1. Setting of the reset mode is performed in bits 12 to 14 in word n+2 of the
output area.
2. The Counter Unit will execute reset with the first count following the fulfill-
ment of the reset conditions.
3. Encoder input Z is only effective for the rising edge. When using the encod-
er input Z under AND conditions with other inputs, ensure that encoder in-
put Z will turn ON last.
4. When repeating reset for the count value, allow an interval of at least 0.1
ms before switching ON the encoder input Z and at least 1 ms before
switching ON the external inputs.
5. It is not possible to execute ON/OFF timing for the internal Reset Bit with
perfect accuracy, due to the communications time required for remote I/O
communications.
Count Value Setting
The count value (the present value) for the Counter Unit can be set as
required, to any value in range –8,388,608 to +8,388,607. Count value setting
can be performed in BCD or hexadecimal.
Note 1. Count value setting is performed by setting a value in words n, n+1 of the
output area as shown below, and switching ON the Count Value Setting Bit
(word n+2, bit 02).
Counter reset condition and timing
Section 5-4