Endress+Hauser Smartec S CLD132, Руководство по эксплуатации

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Smartec S CLD132/134 PROFIBUS-PA/-DP System integration
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Physical Block (device block)
A Physical Block contains all the data that uniquely identify and characterize the
transmitter. It is an electronic version of a nameplate on the transmitter. Parameters of the
Physical Block are, for example, device type, device name, manufacturer's identification,
serial number, etc.
A further task of the Physical Block is the management of general parameters and functions
that influence the execution of the other 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
• On-site hardware write protection
By pressing the "Enter" and the "Plus" keys simultaneously, you can lock the device for on-
site configuration operations.
Use the "Cal" and "Minus" keys to unlock the device. You can find more information in the
standard Operating Instructions under "Locking/Unlocking keypad".
• Hardware write protection via PROFIBUS
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.
• Software write protection
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.
Parameter LOCAL_OP_ENABLE
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.
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
return to the locked status as soon as communication is functioning again.
Parameter PB_TAG_DESC
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.