3. I/O Highway
GEM80-400
Page 3-20
ALSPA GEM80-400 SERIES CONTROLLER TECHNICAL MANUAL
Issue 3 04/99
Note that for all lengths up to 10m the maximum current is 2.1A.
For lengths greater than 10m the current carrying capacity may be calculated
as follows:
Length in Metres =
21
Current in Amps
The maximum length for a Basic I/O ribbon cable is 30m.
Table 3.10 - Standard Controller
Slot No.
8
7
6
5
4
3
2
1
Total
PSU
spare
Module
8239
(mA)
9032
capacity
Current
at +5v
2500
7000
Current
at +15V
500
2000
Table 3.11 - Enhanced Controller
4
3
2
1
1
2
3
4
5
PSU
spare
Module
8239
Total
(mA)
9017
capacity
Current
at +5V
2500
12000
Current
at +15V
500
8000
Table 3.12 may be used to calculate the current consumption for a 12 slot I/O
subrack.
Table 3.12 - 12-Slot I/O Subrack
Slot No.
12
11
10
9
8
7
6
5
4
3
2
1
Module
Total (mA)
Current
:
at +5v
Current
:
at +15V
3.10.3. Power for 8191 Verification I/O Expanders
It is recommended that copies of Tables 3.10 and 3.11, given at the end of this
chapter as part of Table 3.14, should be completed as an aid to addressing and
to draw attention to the 5V and +15V requirement of I/O Modules.
Note...
Care must be taken to ensure that the controller power capacity or
ribbon cable capacity is not exceeded.
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