The H51q System Family
18
4.3.5 The I/O Bus
With the I/O subrack, the connection element for the I/O bus is the F 7553 coupling module
plugged into slot 17. The connection of the I/O bus between the individual I/O module subracks
is established at the rear side via the BV 7032 data cable which is connected to the plugs
XD .1 and XD .2. The I/O bus in the I/O module subracks is integrated in the bus board.
An F 7546 bus termination module is plugged into the XD .2 connector of the last I/O module
subrack to terminate the I/O bus.
4.3.6 I/O Modules
The I/O modules are used for signal transfer and signal matching between the plant and the
central devices. The input and output circuits are always fed into the I/O modules via cable
plugs on the front side. The status of the digital signals is shown on the LEDs of the cable
plugs. The power supply is either via the cable plugs or via the I/O bus board. The order of the
different I/O module types does not matter.
All I/O modules can be pulled out or inserted during operation (see chapter 8.1.1)
4.3.7 ATEX (Ex)i-Modules
The current (Ex)i modules exist in two construction models:
– non-varnished, with PCB covering
– varnished, with PCB covering
Any models can be equipped together without free slots between.
Non-varnished (Ex)i modules may combined together with non-(Ex)i modules without any re-
strictions. Also no free slots are necessary on the left or on the right.
With varnished (Ex)i modules with PCB covering the right slot has to remain free in combina-
tion with non-(Ex)i modules or has to be equipped with a front plate including partition plate
(M 2214). This is also valid for slot 15. The slot left to the (Ex)i module may be equipped with
any other module. Spare slots have to be covered by front plates M 2215 (4 spacing units SU)
or M 2217 (8 spacing units SU).
Usable partition plates and front plates:
M 2214 Front plate with partition plate 100 x 160 mm
M 2215 Front plate 4 SU
M 2217 Front plate 8 SU
Cable plugs for intrinsically safe circuits are marked and have coded pins, so that they can only
be plugged into the appropriate modules.
4.3.8 Safety-Related Output Modules for SIL 3
All the safety-related output modules meet the requirements of the SIL 3.
The safety-related output modules have three semiconductors connected in series. That
means that more than the required second independent component for safety shutdown is now
integrated in the output module.
In case of a fault of an output module the requirements of the SIL 3 are valid without time limit.
In the following this feature is called the integrated safety shutdown.
If a safety-related output module should fail during operation then it will be automatically
switched off with the integrated safety shutdown
to get the safe de-energized status.
The coupling module F 7553, which has to be installed in each I/O subrack, is able to switch
off the watchdog signal (WD) of the I/O subrack. Even in case of a very seldom double fault
only the related I/O subrack will be switched off but not the entire system.
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