GEM80-400
3. I/O Highway
Issue 3 04/99
ALSPA GEM80-400 SERIES CONTROLLER TECHNICAL MANUAL
Page 3-21
In order to establish the amount of power required, copies of Table 3.12, given at
the end of this chapter as part of Table 3.14, should be filled in for each rack.
Table 3.13 (Example of full table filled in) shows an example of how this is done.
Current consumption figures can be found in Chapter 6 of this manual or in the
relevant User Information sheets. To establish the power available in the
controller power supply module, see the 'Power Supply Modules Specification'
section of Chapter 6.
Chapter 6 gives full details of the power available from the following power
modules: 9017, 9018, 9032, 8917, 8918. Subtract the consumption figures given in
Tables 6.1 and 6.2 for the Central Highway Modules to obtain the power
available to the Basic and Verification I/O equipment. In addition to the power
consumed by the I/O equipment, the 8191 Verification I/O Expander requires its
own power which is drawn from either discrete wiring or through the Verification
I/O ribbon cable. The current carrying capacity of this cable is specified in Table
3.9. The 8191 requires 900mA for its own use and it can be seen that with 3 or
more expanders being used, the maximum current for the I/O ribbon cable will
be exceeded. The power drawn by the 8191 Verification I/O Expander through
the Verification I/O ribbon cable for the I/O modules fitted and for its own
requirements can be reduced by supplying the requirement through discrete
wiring.
The Verification I/O Modules require a +5V supply. This is not available on the
Verification I/O ribbon. The +5V is therefore supplied either from the power
module in the I/O subrack in which the Verification I/O Module is fitted, a power
module from an adjacent subrack or a separate (external) supply.
3.10.4. Powering I/O Modules through the I/O Highway Ribbon Cables
The simplest method of powering an I/O subrack is through the I/O ribbon
cables, provided the current carrying capacity of the cables is not exceeded
and the capacity of the power supply module is not exceeded.
The total current should not exceed 2.1A, and the voltage drop in the cable
must not exceed 3V. The current carrying capacity of I/O Ribbon cables up to
30m in length is given in Table 3.9. The remaining current available, if any, can
be taken by discrete wiring from the backplane terminal block.
When the Basic I/O ribbon cable is used to power the 8859-4003 12-slot I/O
subrack a link must be connected between Terminals 4 and 6 of Terminal Block
TB1 (on the 12-slot subrack backplane) to connect the ribbon cable supply to
the subrack backplane.
When the Verification I/O ribbon cable is used to power the 8859-4003 12-slot I/O
subrack a link must be connected between Terminals 6 and 9 of Terminal Block
TB1 (on the 12-slot subrack backplane) to connect the ribbon cable supply to
the subrack backplane.
If sufficient capacity is available from the power supply module and the ribbon
cable has sufficient carrying capacity, more than one subrack can be powered
from each I/O Ribbon cable. Figure 3.7 shows multiple subracks powered from
the Basic I/O Ribbon cable.
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