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92 T1/T1S User’s Manual
6. Programming Information

6.1 Devices and registers

The T1/T1S program consists of bit-based instructions that handle ON/OFF information,
such as contact and coil instr uctions, and reg ister-based (16-bit ) inst r uctions, such as
those f or dat a transfer and arithmet ic oper at ions.
Devices are used to store the ON/OFF inf or mation of cont acts and coils, and reg ist er s
are used to stor e 16- bit data.
Devices are divided into six types:
X External input devices
Y External output devices
R Auxiliary relay devices
S Special devices
T. Timer devices
C. Counter devices
Registers ar e divided into eight types:
XW External input registers
YW External output r egisters
RW Auxiliary relay register s
SW Special reg ist er s
T Timer r egisters
C Counter reg ist er s
D Data regist er s
I, J, K Index registers

Device and register numbers

X devices share the same m em or y area as XW registers. Device X014, for example,
represents t he num ber 4 bit in the XW01 register .
Bit position / Num ber
(MSB) (LSB)
FEDCBA9876543210
XW01 1
X014
Thus, " X014 is ON" means that bit number 4 of XW01 is 1.
Y, R, and S devices work in a sim ilar m anner .
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