The H41q and H51q System Families

and the real-time clock on the central module

– Three power distribution modules 24 V DC for fusing of the power supply

for the inputs and outputs.

– A maximum of 12 slots for input and output modules for digital and

analogue signals

– Direct connection of I/O modules to the central module. All functions

necessary for the connection of the I/O bus are integrated in the H41q

central module

– Integrated cable tray

– Additional modules to connect and to decouple the supply voltage

24 V DC, to supply the watchdog signal and as fan plug-in unit with

fuse and fan run monitoring.

3.1 Conceptions of the Safety Switch Off

In case of faults of output, coupling and central modules and group

switch off

In the system descriptions the safety related PES H41q-MS, -HS, -HRS

the ways for shut down if a fault occurs are shown. Depending on the fault

location the reactions of the systems are fixed or they can be defined in

the user’s program by means of the building block H8-STA-3 and with activating

of a system variable for emergency off.

Explanation of the table:

1) Module switch off

A faulty testable output module with integrated safety shutdown will

be switched automatically to the safe deenergized safe status.

2) group shut down

If it is requested, a group shut down may be agreed in the user’s program

so, that all testable output modules appertaining to the group with the faulty

module are also be switched off.

Inside the user’s program up to 10 testable output modules can be assigned

to one group by means of the building block H8-STA-3.

3) Switch off WD of the appertaining CU

In this case the watch dog signal (WD) of the appertain-ing 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 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.

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 watch dog signal of the related central

module is switched off. That means only the related I/O modules are switched

off.

3.2.2 Central Module F 8653

The central module of the PES H41q-M contains the essential functions

demonstrated in the structure of the central module:

– Microprocessor

– Flash-EPROMs of the program memory for the operating system and

the user's program usable for min. 100.000 writing cycles

– Data memory in sRAM

– Multiplexer to connect I/O bus, DPR and redundant CU (not used in

the H41q-M system)

– Dual Port RAM for fast memory access to the second central module

(not used in the H41q-M system)

– 2 interfaces RS 485 with galvanic isolation. Transmission rate: max.

57600 bps. Set to 9600 bps and to 57600 bps by switch, or setting

also of other transmission rates by software (the software values have

priority)

– Diagnostic display and 2 LEDs for information out of the system, I/O

level and user's program

– Power supply monitoring

– I/O-Bus logic for the connection to the input/output modules

– Hardware clock, battery backed

– Fail-safe watchdog.

– Battery backup of the sRAMs via batterie with monitoring.

3.2.3 Mechanical Structure and Design

The data sheet of the B 4230 assembly kit shows the mechanical structure

and design of the H41q-M PES.

3.2.4 24 V DC Supply and Distribution

For information to the connection of the supply voltage 24 V DC see

B 4230, wiring assembly kit and chapter 3.8, I/O Level.

3.2.5 5 V DC Supply and Distribution

The 5 V DC power supply does not have to be wired separately as it is already

installed as part of the subrack.

The 5 V DC power is needed by the CPU, the control of the interfaces, and

the data register of the I/O modules. It is generated by a clocked 24 V DC/

5 V DC power supply module bearing the F 7130A identification.

The 5 V DC output voltage of the power supply module (for the CPU, I/O,

and the interfaces) are monitored on the central unit checking undervoltage

or failure.

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 a lithium battery which is also on the central

module.

3.2.6 The I/O Bus

Just plugging-in the central module into the subrack establishes connection

to the I/O modules. No further steps are required.

3.3.2 Central Module F 8653

The central module of the PES H41q-H contains the essential functions

demonstrated in the structure of the central module:

– Microprocessor

– Flash-EPROMs of the program memory for the operating system and

the user's program usable for min. 100.000 writing cycles

– Data memory in sRAM

– Multiplexer to connect I/O bus, DPR and redundant CU

– Dual Port RAM for fast memory access to the second central module

– 2 interfaces RS 485 with galvanic isolation. Transmission rate: max.

57600 bps. Set to 9600 bps and to 57600 bps by switch, or setting

also of other transmission rates by software (the software values have

priority)

– Diagnostic display and 2 LEDs for information out of the system, I/O