HIMA F8627 Ethernet communication module

Description

F8627 To supply the I/O racks, on the rear of the central rack the supply voltage

5 V DC and the appertaining GND is available.The 5 V DC power needed

for the microprocessor system and as control current for the I/O modules

is generated from the 24 V DC power of the system via clocked 24 V DC

/ 5 V DC power supply modules bearing the F8627 identification. One

central rack can be equipped with a maximum of 3 power supply modules.

The power supply modules are switched in parallel. One or two power sup

ply modules are usually able to supply the PES. A further power supply

module is used to increase availability.

The output voltage of the power supply modules is checked as to under

voltage or failure by a monitoring module F8627.

In case of a faulty power supply module the operating system supplies the

user’s program via a system variable with this information.

In case the 5 V DC system power fails hardware clock and sRAM on the

central module are buffered by one lithium battery on the central module.

Two lithium batteries on the power supply monitoring module F 7131 are

to buffer the sRAM on the coprocessor module.

4.7.8 F8627 The I/O Bus

The data connection of the I/O level with the central device is established

via the I/O bus. Because the I/O bus is redundant each central device has

its own I/O bus and thus also separated own I/O subracks. The 1st I/O bus

is associated to central module 1 and the 2nd I/O bus associated to central

module 2.

In case of an error the plant is to be driven in the safe state. For systems

with a defined safety state this is the lowest energetic state. According to

the defined reaction on faults during operation (refer to the table in chapter

4.1) different levels of shut down are executed. If in the H51q-HRS system

a central shut down is necessary because of a fault the watchdog signal

(WD) of the appertaining central module will be switched off.

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