The H41q System Family
9
Explanations to the table:
Parameter “Display only“
Switch-off by means of the integrated safety shutdown inside the output amplifier. If not possi-
ble then shutdown of the watchdog signal in the I/O rack by means of the coupling module (only
in systems H51q). No shutdown of the watchdog signal of the appertaining central unit. This
parameter is permissible only up to SIL 1.
Parameter “Normal operation“
Reaction as with parameter “Display only“, additionally switch-off of the watchdog signal of the
appertaining central unit if necessary. Parameterization required from SIL 2. Normal and re-
commended parameter.
Parameter “Emergency off“
Switch-off of the watchdog signal of the appertaining central unit and thus shutdown of the out-
put amplifiers in case of a fault in the output module.
The watchdog signal is not switched off at faults in the input modules.
Module switch-off
A faulty testable output module with integrated safety shutdown will be switched automatically
to the safe de-energized status.
Group shutdown
If it is requested, a group shutdown may be defined in the user program in a way that all test-
able output modules appertaining to the group with the faulty module are also switched off.
Inside the user program up to 10 testable output modules can be assigned to one group by
means of the function block H8-STA-3.
WD switch-off of the appertaining CPU
In case of a fault the watchdog signal (WD) of the appertaining central module is switched off.
If systems with redundant central modules and a common I/O bus are used then the output
modules are related to both central modules. In case of a fault both the watchdog signals of
the central modules are switched off. That means all the I/O modules are switched off (only at
H41q-H/HS).
If systems with redundant central modules and redundant I/O bus are used then the output
modules are related to one central module and one I/O bus. In case of a fault only the watchdog
signal of the related central module is switched off. That means only the related I/O modules
are switched off (only at H41q-HR/HRS). The redundant central module is still in operation.
3.3 The Input/Output Level
In the subrack, slots 1 to 13 are provided for the input/output modules. Any arrangement of
I/O module types is possible. In PES with redundant I/O bus, the modules on slots 1 to 7 are
assigned to the first I/O bus and 8 to 13 to the second I/O bus.
There is an integrated cable tray under the subrack. It is equipped with a receptacle for the
label which can be flapped open to provide easy access to the cables.
3.3.1 24 VDC Supply and Distribution
For 24 VDC supply and distribution we recommend to use the K 7212, K 7213, K 7214, K 7215
subassemblies or fuse distributor K 7915.
They include all components for the fusing of up to 18 individual supply circuits with circuit
breakers.
The K 7212 is additionally equipped with decoupling diodes and filters with monitoring relays
for mains supply.
Additionally you could use also a power supply of the PS1000 series (see ELOP II CD).
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