Temporarily Disabling Priority Mode Servicing - Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual

Peripheral Servicing Priority Mode
Conditions
Time Slice for Time Slice for
Peripheral Instruction
Servicing Execution
01 to FF: (0.1 to 05 to FF: (5 to
25.5 ms) 255 ms)
00 00
Any other
Auxiliary Area Information
Words
A266 and A267 00000000 to
FFFFFFFF Hex
(0 to 4294967295
decimal)
6-9-2

Temporarily Disabling Priority Mode Servicing

• The setting cannot be made from the CX-Programmer for CS1 or CJ1
CPU Units. The setting can be made from CX-Programmer Ver. 2.1 or
higher for CS1-H and CJ1-H CPU Units.
Specified Units
and Ports
All correct settings Peripheral Servicing Priority
00 and correct set-
tings
Correct, but redun-
dant settings
Some illegal set-
tings
All 00 settings
00 and illegal set-
tings
All illegal settings
---
---
Note If an error is detected in the PLC Setup, A40210 will turn ON and a non-fatal
error will occur.
If the slice times are set for program execution and peripheral servicing, the
total of all the program execution and peripheral servicing slice times will be
stored in A266 and A267. This information can be used as a reference in mak-
ing appropriate adjustments to the slice times.
When Peripheral Servicing Priority Mode is not being used, the program exe-
cution time will be stored. This value can be used in determining appropriate
settings for the slice times.
Contents
Total of all slice times for program execution
and all slice times for peripheral servicing.
0.0 to 429,496,729.5 ms (0.1-ms increments)
A267
(Most-signifi-
cant bytes)
Data concurrence is not guaranteed at the following times if Peripheral Servic-
ing Priority Mode is used.
• When more than one word is read from a peripheral device using a com-
munications command. The data may be read during different peripheral
servicing time slices, causing the data to not be concurrent.
• When instructions with long execution times are used in the program, e.g.,
when transferring large quantities of I/O memory data. The transfer oper-
ation may be interrupted for peripheral servicing, causing the data to not
be concurrent. This can be true when words being written by the program
are read from a peripheral before the write has been completed or when
CPU Unit operation
Mode
Peripheral Servicing Priority
Mode for items with correct
settings
Normal operation
Normal operation
Normal operation
Meaning
Value is stored
A266
as 32-bit binary
(Least-signifi-
(8-digit hexadeci-
cant bytes)
mal) value
Section 6-9
PLC Setup errors
None
Generated
Generated
None
Generated
Refreshing
The contents is
refreshed each cycle
and is cleared at the
beginning of opera-
tion.
351