Tr (Temporary Relay) Area - Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual

TR (Temporary Relay) Area

Background Execution Information (Single CPU Systems Only)
Name
DR00 Output for Background
Execution
IR00 Output for Background
Execution
Equals Flag for Background
Execution
ER/AER Flag for Background
Execution

8-12 TR (Temporary Relay) Area

Examples
304
Address
A597 When a data register is specified as the output for an
instruction processed in the background, A597 receives the
output instead of DR00.
0000 to FFFF hex
A595 and When an Index Register is specified as the output for an
A596 instruction processed in the background, A595 and A596
receive the output instead of IR00.
0000 0000 to FFFF FFFF hex
(A596 contains the leftmost digits.)
A59801 Turns ON if matching data is found for an SRCH(181)
instruction executed in the background.
A39510 Turns ON if an error or illegal access occurs during back-
ground execution. Turns OFF when power is turned ON or
operation is started.
The TR Area contains 16 bits with addresses ranging from TR0 to TR15.
These temporarily store the ON/OFF status of an instruction block for branch-
ing. TR bits are useful when there are several output branches and interlocks
cannot be used.
It is not necessary to consider TR bits when displaying ladder diagrams on the
CX-Programmer.
The TR bits can be used as many times as required and in any order required
as long as the same TR bit is not used twice in the same instruction block.
TR bits can be used only with the OUT and LD instructions. OUT instructions
(OUT TR0 to OUT TR15) store the ON OFF status of a branch point and LD
instructions recall the stored ON OFF status of the branch point.
TR bits cannot be changed from a Programming Device.
In this example, a TR bit is used when two outputs have been directly con-
nected to a branch point.
In this example, a TR bit is used when an output is connected to a branch
point without a separate execution condition.
Description
Instruction
LD
OR
OUT
AND
OUT
LD
AND
OUT
Instruction
LD
OUT
AND
OUT
000003
LD
OUT
Section 8-12
Access
Read-only
Read-only
Read-only
Read-only
Operand
000000
000001
TR 0
000002
000003
TR 0
000004
000005
Operand
000000
TR 0
000001
000002
TR 0
000003