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Operation
with holding register 55 (Controller [1]) and
115 (Controller [2]) u KH 6495-2.
− Value 1 = Set point SP1 active
− Value 2 = Set point SP2 active
− Value 3 = Set point SP3 active
− Value 4 = Set point SP4 active
The switchover over Modbus has the same
priority as switchover using the keys.
The set point switchover cannot be per-
formed either using the keys or over Modbus
if the set point switchover over the digital in-
puts is configured.
8.4 Locking the controller
The controller can be protected against un-
authorized access. There are three ways to
implement the locking of the controller:
− Locking the operating level
Î See section 8.4.1.
− Locking all keys over a digital input
Î See section 8.4.2.
− Activating key number operation
Î See section 8.4.3.
8-14
8.4.1
Locking the operating
level
Switchover between manual and automatic
mode as well as changes to the set point for
both Controller [1] and Controller [2] can be
locked independently from one another.
Locking is performed in the C.7 Operator
keys submenu of either Controller [1] or [2]
by setting the configuration items C.7.2-1
Lock manual/auto key = On and/or
C.7.3-1 Lock set point keys = On.
Example: The set point adjustment of Con-
troller [1] is to be locked.
The controller is currently in the operating
level.
Î Enter the configuration menu (see the
'Start-up and configuration' section).
EB 6495-2 EN
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