Switch-On Phase - Siemens SITRANS LG250 Operating Instructions Manual

Hardware addressing
Software addressing
26
The hardware addressing is effective if an address <126 is set with
the address selection switches on the instrument. Software address-
ing is then no longer effective, the set hardware address applies.
Bus
Fig. 17: Address selection switch
1 Addresses <100 (selection 0), addresses >100 (selection 1)
2 Decade of the address (selection 0 to 9)
3 Unit position of the address (selection 0 to 9)
Software addressing is only effective if address 126 or higher is set
on the instrument with the address selection switches.
The addressing procedure is described in the operating instructions
manual "Display and adjustment module.
5.6

Switch-on phase

After connecting SITRANS LG250 to the bus system, the device first
performs a self-test:
•
Internal check of the electronics
•
Indication of the status message "F 105 Determine measured
value" on the display or PC
•
Status byte goes to fault value
Then the actual measured value is output to the signal cable. The
value takes into account settings that have already been carried out,
e.g. default setting.
SITRANS LG250 - Operating Instructions
0 0 0
+
1 2
5 6 7 8
( ) (-)
1
2
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PBD-51041053