ElmoMC SimplIQ Software Manual - Manual (Page 188)

SimplIQ Software Manual Sensors, I/O and Events
MAN-SIMSW (Ver. 1.4)
12-3
12.4 Events and Response Methods
SimplIQ drives identify the following events 5 :
ƒ Change in a GPI (general-purpose digital input)
ƒ Change in a limit switch
ƒ Change in a Home switch
ƒ Change in an Enable switch
ƒ Change in a Stop switch
ƒ Change in a Begin switch
ƒ Encoder Index pulse
In order to identify an event, the event must be defined. From the events in the previous
list, only the Index is defined permanently. All other events are programmable. The
SimplIQ drive’s six digital connector pins can be routed, with direct or inverted polarity,
to functions such as general-purpose digital input or RLS. To learn how to route
connector pins to functions, refer to the IL[N] command section of the
SimplIQ Command
Reference Manual.
Events can be handled at the following speed levels:
ƒ
Manual query
ƒ Periodic query
ƒ Automatic routines
ƒ Real time (motion management, homing, capture and flag)
12.4.1 Manual Query
The manual query is the simplest method of events handling. By using the IP/IB[N]
commands, one can query the state of the input pins and the user-program logics or a
host can review the query results. The following table summarizes some of the manual
query properties.
Topic Comment
Capture probability Low. Even if a digital input is continuously polled (by
communication or by loading a user program), an input pulse
may slip away unnoticed between consecutive polls.
Deterministic delay No. Depends on the non-deterministic delays of the Interpreter
or the user program management.
Use Non-time-critical queries. Simple operations.
Table 12-2: Manual Query Properties
5 The Harmonica also identifies emergency events such as over-voltage, short-circuit or over-
current. The emergency events are explained in Chapter 13.