6F3B0250
Basic Hardware and Function 95
6. Programming Information
External input devices (X)
These devices (X) indicate the ON/OFF states of external input signals through the input
circuits. Exter nal input devices can be used many times in a pr ogram.
External output devices (Y)
The external output devices (Y) store the ON/OFF signals that drive the external devices
throug h t he output circuits. They can be used for coils in a program.
External input registers (XW)
These (X W) are 16-bit r egisters f or storing values which are received from the input
circuits.
External output registers (YW)
These 16-bit r egisters (YW) are used for storing values which are sent to the out put
circuits.
Auxiliary relay devices and registers (R/RW)
The auxiliary relay devices (R) are used to store intermediate results of sequences. The
auxiliary relay registers (RW) are used to store temporary results of function instructions.
The data in R/RW cannot be output directly to the output circuits. It is necessary to move
the data t o Y/ YW.
It is possible to m ake these reg ist er s r etentive so that they retain dat a in the event of a
power failure. See section 5.3.
Timer devices and registers (T./T)
The timer registers (T) are used for storing the elapsed time of t im er inst r uctions, the
on-delay (TO N) , off - delay (TOF) and sing le- s hot ( SS) timers.
0.01 s base timer s and 0. 1 s base timers are provided.
Time base T1 T1S
0.01 s T000 to T031 T000 to T063
0.1 s T032 to T063 T064 to T255
The timer devices (T.) works as the output of t he timer instruct ions.
It is possible to specify the T registers as retentive to retain their dat a in the event of a
power failure. See section 5.3.
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net