2 Instructions
2-20 CP1E CPU Unit Instructions Reference Manual(W483)
TR
Function
TR bits are used to temporarily retain the ON/OFF status of execution conditions in a program when
programming in mnemonic code. They are not used when programming directly in ladder program form
because the processing is automatically executed by the Peripheral Device. The following diagram
shows a simple application using two TR bits.
Instruction Mnemonic Variations Function
code Function
TR Bits TR --- ---
TR bits are used to temporarily retain the ON/OFF
status of execution conditions in a program when
programming in mnemonic code.

Using TR0 to TR15

•TR0 to TR15 are used only with LOAD and
OUTPUT instructions.
•There are no restrictions on the order in
which the bit addresses are used.
•Sometimes it is possible to simplify a pro-
gram by rewriting it so that TR bits are not
required. The following diagram shows one
case in which a TR bit is unnecessary and
one in which a TR bit is required.
In instruction block (1), the ON/OFF status at
point A is the same as for output CIO 100.00,
so AND 0.01 and OUT 100.01 can be coded
without requiring a TR bit. In instruction block
(2), the status of the branching point and that
of output CIO 100.02 are not necessarily the
same, so a TR bit must be used. In this case,
the number of steps in the program could be
reduced by using instruction block (1) in place
of instruction block (2).
LD 0.00
OUT
Coding
TR0
AND 0.01
OUT TR1
AND 0.02
OUT 100.00
LD TR1
AND 0.03
OUT 100.01
LD TR0
AND 0.04
OUT 100.02
LD TR0
AND NOT 100.00
OUT 100.03
Relay Address
TR0 to TR15Temporary Relay
Instruction Operands
0.00 0.01 0.02
0.03
0.04
0.05
100.00
100.01
100.02
100.03
TR0 TR1
A
0.00
0.01
0.02 0.03
(2)
100.00
100.01
100.02
100.03
TR0
(1)