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8.2.2 Trigger modes
We can simplify the trigger signals into four: ‘On’, ‘Off’, ‘On and Off’, and ‘Change’ modes. Thus,
the user can should set a mode for respective triggers using [Trigger Mode1] and others.
(i) ‘On’ mode
In the ‘On’ mode, the event recorder can take an action when the trigger signal is switched to
‘On’, as shown in Figure 8.2-2. For the operation, set On for the [Trigger Mode*].
Figure 8.2-2 Trigger generated at ‘On’ mode
(ii) ‘Off’ mode
The ‘Off’ mode is the other way of the ‘On’ mode; set Off for the operation.
Figure 8.2-3 Trigger generated at ‘Off’ mode
(iii) ‘On-Off’ mode
In the ‘On-Off’ mode, the trigger signal is generated when the pulse train is changed from ‘On
to Off’ and ‘Off to On’ both, as shown in Figure 8.2-4. Set On-Off for the operation
Figure 8.2-4 Trigger generated at ‘On-Off’ mode
(iv) ‘Change’ mode
The ‘Change mode’ is provided to detect the increment or the decrement of a number, when
new number is generated in the PLC logic. For example, this mode allows to detect the change
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