Siemens LMV5 Series Technical Instructions page 288

Technical Instructions
Document No. LV5-1000
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
Setpoint W1
Setpoint W2
External setpoint W3
Set target load mod / multistage
Local / Remote
Selection of manual or automatic operation
Operating mode: Remote "off" / remote
"on" / W3
Operating mode with load controller
Note: An AZL5 reset will be triggered when switching power on, or in the event of severe system errors.
Section 8
Address Storage location
47 EEPROM
48 EEPROM
44 RAM
45 RAM
41 RAM
40 EEPROM
43 RAM
39 EEPROM
Page 18
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Preselection
See Basic Documentation «Menu
and parameter lists»
See Basic Documentation «Menu
and parameter lists»
«0» will be reinitialized when
resetting the AZL...
«0» will be reinitialized when
resetting the AZL...
«Local»
See Basic Documentation «Menu
and parameter lists»
«Auto» will be reinitialized when
resetting the AZL...
See Basic Documentation «Menu
and parameter lists»
LMV Series
Choices for making
changes
• On the AZL... (menu)
• Preselection via
Modbus
• On the AZL... (menu)
• Preselection via
Modbus
• On the AZL... (menu)
• Preselection via
Modbus
• On the AZL... (menu)
• Preselection via
Modbus
• Via Modbus
• On the AZL... (menu)
• Via lapse of timer
«Communication
failure» from Remote
to Local
• On the AZL... (menu)
• Preselection via
Modbus
SCC Inc.