Endress+Hauser PROFIBUS-DP, Руководство по эксплуатации, Страница: 14 / 52

SmarTec S CLD 132 PROFIBUS-PA/-DP Operation
14 EHauser
Physical Block (device block)
A Physical Block contains all the data that uniquely identifies and characterises the
transmitter. It is an electronic version of a nameplate on the transmitter. Parameters of
the Physical Block include the device type, device name, manufacturer ID, serial
number, etc.
A further task of the Physical Block is the management of general parameters and
functions that have an influence on the execution of the remaining blocks in the
transmitter. The Physical Block is thus the central unit that also checks the device status
and thereby influences or controls the operability of the other blocks and thus also of
the device.
Write protection
•
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By pressing the
&
and
/
keys simultaneously, you can lock the device for on-site
configuration operations.
Use the
;
and
3
keys to unlock the device. More information can be found in the
SmarTec S Operating Instructions BA 207C/07/en under "Locking/Unlocking
keyboard" (Chapter 5: operation).
•
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The HW_WRITE_PROTECTION parameter indicates the status of the hardware write
protection. The following statuses are possible:
1: Hardware write protection enabled, device data cannot be overwritten
0: Hardware write protection disabled, device data can be overwritten
•
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You can also set software write protection to prevent all parameters from being
acyclically overwritten. You can do so by making an entry in the WRITE_LOCKING
parameter. The following entries are permitted:
2457: Device data can be overwritten (factory setting)
0: Device data cannot be overwritten
LOCAL_OP_ENABLE parameter
You can use the LOCAL_OP_ENABLE parameter to permit or lock local operation at the
device. The following values are possible:
•
0: Deactivated.
Local operation is locked. You can only change this status via the bus.
The code 9998 is displayed in the local operation. The transmitter behaves just as with
hardware write protection via the keyboard (see above).
•
1: Activated.
Local operation is active. However, commands from the master have a higher priority
than local commands.
Note!
Local operation is automatically activated if communication should fail for longer than
30 seconds.
If communication fails when local operation is locked, the device will immediately go to
the locked status as soon as communication is functioning again.
PB_TAG_DESC parameter
You can set the client-specific device number (tag number) via:
•
Local operation in menu field I2 (INTERFACE function group) or via
•
PROFIBUS parameter TAG_DESC of the Physical Block.
If you change the tag number via one of the two options, the change can also be seen
immediately at the other position.