120
TR (Temporary Relay) Area
Section 4-8
4-8
TR (Temporary Relay) Area
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 and are used only with mnemonics. TR bits are useful when there are sev-
eral output branches and interlocks cannot be used.
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.
Forcing Bit Status
TR bits cannot be changed from the CX-Programmer.
Examples
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.
Note
A TR bit is not required when there are no execution conditions after the
branch point or there is an execution condition only in the last line of the
instruction block.
LD
OR
OUT
AND
OUT
LD
AND
OUT
0.00
0.01
TR 0
0.02
0.03
TR 0
0.04
0.05
Instruction
Operand
TR0
0.00
0.05
0.01
0.02
0.04
0.03
LD
OUT
AND
OUT
LD
OUT
0.00
TR 0
0.01
0.02
TR 0
0.03
Instruction
Operand
TR0
0.00
0.01
0.02
0.03
LD
0.00
OUT
0.01
AND
OUT
0.02
0.03
LD
0.00
OUT
OUT
0.01
0.02
Instruction
Operand
Instruction
Operand
0.00
0.01
0.02
0.00
0.01
0.03
0.02
Summary of Contents for CP1L-EL20DR-D
Page 3: ...CP1L EL20D CP1L EM30D CP1L EM40D CP1L EL EM CPU Unit Operation Manual Produced July 2017...
Page 4: ...iv...
Page 10: ...x...
Page 22: ...xxii...
Page 34: ...xxxiv Software Licenses and Copyrights 7...
Page 192: ...158 Trial Operation and Debugging Section 5 3...
Page 250: ...216 Automatic Clock Adjustment and Specifying Servers by Host Name Section 6 7...
Page 666: ...632 Trouble Shooting Section 11 7...
Page 696: ...662 Standard Models Appendix A...
Page 805: ...771 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 806: ...772 Connections to Serial Communications Option Boards Appendix F...
Page 836: ...802 PLC Setup Appendix G...
Page 838: ...804 TCP Status Transitions Appendix H...
Page 840: ...806 Ethernet Network Parameters Appendix I...
Page 842: ...808 Buffer Configuration CP1L EL EM Appendix J...
Page 844: ...810 Ethernet Specifications Appendix K...
Page 851: ...Index 817 work words 118 write protection 447...
Page 852: ...818 Index...
Page 854: ...820 Revision History...
Page 855: ......