Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Spezifikationen PDF herunterladen (Seite 19)

DPU Switch Settings and Button Controls

new CE code image and store it into flash memory. See

Chapter 5, "Installing CP Firmware Flash Via Network

Download."

F X Normal operating mode. Will use the database stored in

flash if available.

DPU Key Switch

Use the DPU key switch, located at the bottom part of the DPU chassis, to

select one of four operating modes. The DPU can operate with the key in

place or removed; you can remove the key from the switch regardless of key

position.

The Key Switch requires a key to change the operating mode of the DPU.

The following is a summary of the switch operation.

Position Description

Run Normal execution of control logic. The DPU will accept

database downloads.

Lock Normal execution of control logic. The DPU will not

accept full database downloads in this mode.

Off-line Will scan inputs but not change any outputs (the outputs

freeze at their last value when entering Off-line mode).

The DPU will accept database downloads.

Between the Valid

Positions

After short time delay will place the DPU in the Offline

mode. If the reset button is pressed in this mode a “hard”

reset will be generated to the DPU. This will cause the

DPU to reset without saving the current database. That

means that when the DPU finishes booting it will not have

a database and one must be downloaded to it.

Using the Reset Button

Pressing this button will cause the DPU to stop controlling and go through a

reset cycle. This should not be done casually as it can cause a severe

disruption to your process.

If the Reset button is pressed while the key switch is in the Run, Lock, or

Off-line position, a soft reset will be generated. In a soft reset, the DPU saves

its database into non-volatile (flash) memory before resetting. After the reset,

the DPU will reload the database that it saved.

If the Reset button is pressed while the key switch in set to a position in-

between the valid detent positions (i.e., not in Run, Lock or Off-Line

position), a hard reset will be generated. In a hard reset, the database is not

saved before the DPU resets. After the reset, the DPU will not have a

database and one will have to be downloaded to it.

If you turn the key switch to an “in-between” position to perform a hard

reset, remember to turn it back to the desired position after pressing the reset

button.

Metso Automation MAX Controls Inc. • 278590 •

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