Siemens SIMATIC PG 720 P Manual page 30

Getting to Know the PG 720
Hard Disk Drive You can use a number of different hard disk drives in your PG 720. The memory
capacity of the particular type of hard disk can be found in the Product
Information Bulletin and SETUP program.
Whenever the hard disk drive is accessed, the access LED on the front of the unit
lights up.
Caution
!
Risk of data loss and damage to drive!
Drives are sensitive to vibrations and shock. Any vibrations occurring during
operation can lead to the loss of data or damage to the drive.
After the operating system has been shut down, wait approximately 5
seconds before switching the device off. This allows the disk to come to a
complete stop and ensures optimal protection.
If you intend transporting the unit, switch it off, and wait until the drive has
come to rest (about 20 seconds) before you move it.
CD-ROM Drive
The CD-ROM drive enables you to read CDs. The drive is operated as a slave
parallel to the hard disk drive via the secondary IDE interface.
Caution
!
Risk of data loss and damage to the drive!
CD-ROM drives are sensitive to vibrations and shock. Any vibrations occuring
during operation can lead to damage to the drive or CD.
Self-Test
Whenever the PG 720 is switched on or reset, the hard disk drive runs
through a self-test which is repeated during operation.
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PG 720 P Programming Device
C79000-G7076-C721-02