Chapter 3. CPU Configuration
GFK-2222AD
April 2018
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3.2
Configuration Parameters
3.2.1
Settings Parameters
These parameters specify basic operating characteristics of the CPU. For details on how these
parameters affect CPU operation, refer to
PACSystems RX7i, RX3i and RSTi-EP
CPU Programmer’s
Reference Manual,
GFK-2950 Chapter 2.
Settings Parameters
Passwords
Specifies whether passwords are Enabled or Disabled. Default: Enabled.
Note:
If Enhanced Security
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is enabled in the target properties, the Passwords setting
will be Enabled and read-only, and the
tab appears.
When passwords are disabled, they cannot be re-enabled without clearing PLC memory.
Stop-Mode I/O
Scanning
Specifies whether the I/O is scanned while the PLC is in STOP Mode. Default: Disabled.
(Always Disabled for Redundancy CPU.)
Note:
This parameter corresponds to the I/O ScanStop parameter on a Series 90-70 PLC.
Watchdog
Timer (ms)
(Denominated in ms, set in 10ms increments.) Requires a value that is greater than the
program sweep time.
The software watchdog timer is designed to detect
failure to complete sweep
conditions.
The CPU restarts the watchdog timer at the beginning of each sweep. The watchdog timer
accumulates time during the sweep. The software watchdog timer is useful in detecting
abnormal operation of the application program, which could prevent the PLC sweep from
completing within the watchdog time period.
Valid range: 10 ms through 2550 ms, in increments of 10 ms.
Default: 200.
For details on setting the watchdog timer in a CPU redundancy system, refer to the
PACSystems Hot Standby CPU Redundancy User Manual,
GFK-2308.
Logic/
Configuration
Power-up
Source
Specifies the location/source of the logic and configuration data that is to be used (or
loaded/copied into RAM) after each power up.
Choices: Always RAM, Always Flash, Conditional Flash.
Default: Always RAM.
Data Power-up
Source
Specifies the location/source of the reference data that is to be used (or loaded/copied into
RAM) after each power up.
Choices: Always RAM, Always Flash, Conditional Flash.
Default: Always RAM.
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For availability, refer to the
Important Product Information
document for the CPU firmware version that you are using.
