Omron Sysmac NX-series, Руководство пользователя

Страница: 182 / 306

8-10 Trigger Input
8-10-1
Function Applications and Overview
This function obtains the input value of the digital input signal to trigger analog input signals, and the
DC time when the digital input value changes.
The function is used to identify the analog input signal that is obtained at the input timing of a digital
input signal. It is used in combination with the Sysmac Library.
In the descriptions below, the "input of a digital input signal" is called "trigger input", and the "DC time
when the input changed" is called the "input changed time".
8-10-2 Details on the Function
This section describes the following operations with the trigger function of the High-speed Analog In-
put Units.
• Trigger input operation
This function is used in combination with the analog inputs of the High-speed Analog Input Units, and
cannot be used with NX Units that support output refreshing with specified time stamp.
Trigger Input Operation
This section describes the trigger input operation of the High-speed Analog Input Units. The operation
is described for each Unit that the High-speed Analog Input Units can be connected to.

CPU Unit Operation
The following describes the trigger input operation of the High-speed Analog Input Units connected
to an NX-series CPU Unit.
• The High-speed Analog Input Units record input changed times for each trigger input bit. The
Units record the DC times when status changes of the input terminals reach the internal circuits
after the ON response time elapses.
If the input filter is used for the Input Filter Setting, the time set in the Input Filter Setting is added
to the ON response time.
• The CPU Unit reads input values and input changed times from the High-speed Analog Input
Units at I/O refreshing.
The CPU Unit reads the input values at I/O refreshing, instead of the input values at the point of
time when the input changed times are recorded.
• The High-speed Analog Input Units that are connected to the CPU Unit read the input changed
times at a fixed interval based on synchronization timing. (Refer to (a) in the figure below.)
• The High-speed Analog Input Units read input values at the timing of I/O refreshing, which is dif-
ferent from the timing of reading input changed times.
• The CPU Unit reads the input changed times and input values at I/O refreshing immediately after
the input changed times are read. (Refer to (b) in the figure below.)
• The interval of I/O refreshing varies depending on the operational conditions of the CPU Unit.
(Refer to (c) in the figure below.) Input changed times are read at a fixed interval. (Refer to (d)
and (e) in the figure below.)
8 Functions
8 - 40
NX-series Analog I/O Units User’s Manual for High-speed Analog Input Units (W592)