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The H51q System Family

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 subrack 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 safe status.

Group shutdown

If it is requested, a group shutdown may be defined in the user program so that all testable

output modules belonging to one 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 this case the watchdog signal (WD) of the appertaining central module will be switched off.

If systems with redundant central modules and a common I/O bus are used then the output

modules are assigned to both central modules. In case of a fault both watchdog signals of the

central modules are switched off, that means all the I/O modules are switched off (only at

H51q-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 H51q-HR/HRS).

Switch-off of the appertaining coupling module

In this case the watchdog signal (WD) of the appertaining coupling module will be switched off,

that means that all I/O modules related to this coupling module will be switched off.

HIMA H41q User Manual

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