Omron NX-EC0112, User Manual

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6 - 55
6 Incremental Encoder Input Units
NX-series Position Interface Units User’s Manual (W524)
6-
9 Fu
nct
ion
s
6
6-
9-5 Gate Co
ntrol
You can specify gate control for each counter.
Gate control is used to perform counting when the gate is open and stop counting when the gate is
closed.
Encoder counter operation commands, including gate control, cannot be allocated as I/O data. There-
fore, the default setting leaves the gate open (counting is enabled).
Refer to Encoder Counter Operation Command on page 6-40 for information on enabling the counter.
Precautions for Correct Use
Always set the gate to open to use an Incremental Encoder Unit assigned to an MC Function
Module axis variable.
Therefore, you cannot perform gate control through encoder counter operation commands or
external inputs when you use an Incremental Encoder Unit with the MC Function Module.
Set the I0, I1, or I2 external input as a gate input to enable or disable the counter through that external
input.
When the gate is open, the counter will count the pulses. When the gate is closed, the counter does not
count any pulses.
If you set the External Input Logic Selection parameter to specify an N.O. contact, the gate will be open
when the external input signal is ON.
If you set the External Input Logic Selection parameter to specify an N.C. contact, the gate will be open
when the external input signal is OFF.
Precautions for Correct Use
If you set an external input to a gate input, the response time from the gate input until the gate
opens or closes is 250
μ
s maximum.
Additional Information
The NX-EC0212 and NX-EC0222 do not have any external inputs.
6-9-5 Gate Control
External Inputs
Gate closed Gate closed Gate open Gate closed Gate closed Gate open
N.O. contact N.C. contact