Specifications

PLC Synchronization
(PC-Handshake):
Whenever the PLC scans the decoder input, it must see stable
data. In order to ensure this, the PLC gives a data transfer
command and a predetermined time later the PLC synch cir-
cuit stabilizes the data for the PLC to read. This time is
adjustable on some AVG Automation units (2 µs to 30 ms),
where as it is fixed on others (50 µs, 100 µs, etc.). The variable
time feature, when available, can be used to provide the most
fresh data to the PLC.
For example, the time interval between the data transfer and
read commands might be 12 ms and say the time delay is set
at 5 ms. After 5 ms of the data transfer command the stable
data is available to the input modules of the PLC and when
the PLC commands the data to be read 12 ms later, it is stable
and valid.
800-TEC-ENGR
www.avg.net
A-20
Position Transducers/Sensors