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Operating Instructions Option Module IEI for b maXX drive PLC BM4-O-
IEI-01
7
O
PERATION
The
I
ncremental
E
ncoder
I
nterface (or IEI) makes possible rapid acquisition of digital sig-
nals. When doing this, the system uses an internal counter to count the signal edges.
The IEI option module offers two operating modes.
m
IEI option module for position acquisition using a rectangle incremental encoder (en-
coder mode)
m
IEI option module as a fast counter of a 24 V signal at input probe 1 (probe mode)
The IEI option module is configured by the application program on the b maXX drive PLC.
For guides to programming the b maXX drive PLC, refer to the b maXX drive PLC Appli-
cation Manual and the PROPROG wt II Programming Manual (or ProProg wt III Online
Help System). This chapter contains guides to configuring and operating the IEI option
module.
7.1
General
Depending on the mode, the IEI option module uses an internal counter to count the sig-
nal edges of the rectangle incremental encoder or the signal edges of a 24 V signal at
input probe 1.
For the contents of this internal counter to be copied synchronously to the b maXX drive
PLC into communication RAM, you must set a trigger source. The trigger signal of this
trigger source is latch condition 1. When this latch condition 1 occurs, the system stores
the counter value to a register. See also
Synchronizing the IEI option module with the
7.1.1
IEI option module for position acquisition using a rectangle incremental encoder (encoder
mode)
In this mode, the system counts the signal edges of a rectangle incremental encoder in
the internal counter. In addition, it is possible to save the counter value in the case of two
different conditions (e.g. the rising and falling edge of a 24 V signal at input "probe 1").
These are latch conditions 2 and 3.
The internal counter can count signals at a frequency of up to 4 MHz. This means that it
is also possible to evaluate high-resolution rectangle incremental encoders.
Below, we will also refer to this mode as encoder mode; it is often set for position acqui-
sition, positioning and synchronous running tasks.
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