Baumuller BM4-O-IEI-01, Operating Instructions Manual, Page: 41 / 92

Operation
Operating Instructions Option Module IEI for b maXX drive PLC BM4-O-
IEI-01
41
of 90
7
Bit 2 - reference cam:
Bit 2 shows whether the reference cam is logically FALSE or TRUE or physically LOW or
HIGH.
Bit 3 - sense line:
Bit 3 shows whether the sense line is physically LOW or HIGH.
The IEI option module supplies a high-resistance HIGH to the sense line. An encoder that
supports the sense signal "pulls" this signal to LOW. This allows the IEI option module to
detect whether an encoder is connected. If the encoder does not support the sense line,
detection is not possible and bit 3 is TRUE.
Bit 4 - encoder zero track:
Bit 4 shows whether the encoder zero track is reached due to its rotation. Bit 4 is FALSE
if the encoder zero track is not reached. If the encoder zero track is reached, Bit 4 switch-
es to TRUE.
Bit 5 - latch condition 2:
Bit 5 only has a meaning in the IEI option module's encoder mode.
In this mode, bit 5 indicates by TRUE (1) that latch condition 2 has been met. The saved
counter value of the rectangle incremental encoder is located in register
*.ud_COUNTER_LATCH2. You can reset display of bit 5 by writing a value of 0 to register
*.ud_COUNTER_LATCH2.
If latch condition 2 is not met, Bit 5 shows FALSE (0).
Bit 6 - latch condition 3:
Bit 6 only has a meaning in the IEI option module's encoder mode.
In this mode, bit 6 indicates by TRUE (1) that latch condition 3 has been met. The saved
counter value of the rectangle incremental encoder is located in register
*.ud_COUNTER_LATCH3. You can reset display of bit 6 by writing a value of 0 to register
*.ud_COUNTER_LATCH3.
If latch condition 3 is not met, Bit 6 shows FALSE (0).
Bit 7 to bit 15 are reserved.
7.3.2 Counter latch register 1
Counter latch register 1 *.ud_COUNTER_LATCH1 shows the value of the IEI option
module's internal counter. The way of counting depends on the IEI option module's mode.
m Encoder mode
The rectangle incremental encoder's signals (or increments) are shown in counter latch
register 1. If a rectangle incremental encoder rotates at 1024 increments/revolutions
four times round its own axis, for example, the system displays in counter latch register
1 a value that is incremented (or decremented, depending on the direction of rotation)
by 4096.
The IEI option module uses an internal register to count the signals (or increments) of