Siemens LMV 5 Series, Technical Instructions, Page: 288 / 374

Technical Instructions LMV Series
Document No. LV5-1000
Section 8 Page 18 SCC Inc.
Notes on operating modes
Modbus downtime
When there is no more communication between BAS and AZL..., the Modbus downtime is used to switch
over from Remote mode to the preselected setpoint in Local mode. The timer will be activated when
changing from Local to Remote. With every permissible Modbus communication to this slave (AZL...),
the timer will be reloaded. Should the timer lapse, the BAS must again set the Remote mode, if
required. The timer value will be retained in EEPROM and will also be retained after power off.
When deactivating the “Gateway BAS” mode (menu item
OptgModeSelect > GatewayBASoff ), automatic
changeover to Local takes place, that is, preselected output W1 will apply.
Changeover of operating mode via parameter 43
This changeover was introduced primarily because of the requirements of boiler sequence control.
In that case, the individual boiler can be operated at low output via manually “On”. When switching to
“Auto” via sequence control, preselected output W3 will be used.
Default parameter settings
Parameter Address Storage location Preselection Choices for making
changes
Setpoint W1 47 EEPROM See Basic Documentation «Menu
and parameter lists»
•
On the AZL... (menu)
•
Preselection via
Modbus
Setpoint W2 48 EEPROM See Basic Documentation «Menu
and parameter lists»
•
On the AZL... (menu)
•
Preselection via
Modbus
External setpoint W3 44 RAM «0» will be reinitialized when
resetting the AZL...
•
On the AZL... (menu)
•
Preselection via
Modbus
Set target load mod / multistage 45 RAM «0» will be reinitialized when
resetting the AZL...
•
On the AZL... (menu)
•
Preselection via
Modbus
Local / Remote 41 RAM «Local»
•
Via Modbus
•
On the AZL... (menu)
•
Via lapse of timer
«Communication
failure» from Remote
to Local
Selection of manual or automatic operation 40 EEPROM See Basic Documentation «Menu
and parameter lists»
•
On the AZL... (menu)
Operating mode: Remote ”off” / remote
“on” / W3
43 RAM «Auto» will be reinitialized when
resetting the AZL...
•
Preselection via
Modbus
Operating mode with load controller 39 EEPROM See Basic Documentation «Menu
and parameter lists»
Note:
An AZL5 reset will be triggered when switching power on, or in the event of severe system errors.
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