Maintenance
and T
roubleshooting
9–14
Maintenance and Troubleshooting
The DL05 Micro PLC allows you to make changes to the application program during
Run Mode. These edits are not “bumpless.” Instead, CPU scan is momentarily
interrupted (and the outputs are maintained in their current state) until the program
change is complete. This means if the output is off, it will remain off until the program
change is complete. If the output is on, it will remain on.
WARNING:
Only authorized personnel fully familiar with all aspects of the
application should make changes to the program. Changes during Run Mode
become effective immediately. Make sure you thoroughly consider the impact of any
changes to minimize the risk of personal injury or damage to equipment. There are
some important operational changes during Run Time Edits.
1. If there is a syntax error in the new instruction, the CPU
will not
enter the Run
Mode.
2. If you delete an output coil reference and the output was on at the time, the output
will remain on until it is forced off with a programming device.
3. Input point changes are not acknowledged during Run Time Edits. So, if you’re
using a high-speed operation and a critical input comes on, the CPU may not see
the change.
Not all instructions can be edited during a Run Time Edit session. The following list
shows the instructions that can be edited.
Mnemonic
Description
TMR
Timer
TMRF
Fast timer
TMRA
Accumulating timer
TMRAF
Accumulating fast timer
CNT
Counter
UDC
Up / Down counter
SGCNT
Stage counter
STR, STRN
Store, Store not
AND, ANDN
And, And not
OR, ORN
Or, Or not
STRE, STRNE
Store equal, Store not equal
ANDE, ANDNE
And equal, And not equal
ORE, ORNE
Or equal, Or not equal
STR, STRN
Store greater than or equal
Store less than
AND, ANDN
And greater than or equal
And less than
Mnemonic
Description
OR, ORN
Or greater than or equal
Or less than
LD
Load data (constant)
LDD
Load data double (constant)
ADDD
Add data double (constant)
SUBD
Subtract data double (constant)
MUL
Multiply (constant)
DIV
Divide (constant)
CMPD
Compare accumulator (constant)
ANDD
And accumulator (constant)
ORD
Or accumulator (constant)
XORD
Exclusive or accumulator (constant)
LDF
Load discrete points to accumulator
OUTF
Output accumulator to discrete points
SHFR
Shift accumulator right
SHFL
Shift accumulator left
NCON
Numeric constant
Run Time Edits
Содержание DL05
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