Alstom GEM80-400 Series, Техническое руководство

Страница: 133 / 325

3. I/O Highway GEM80-400
Page 3-4 ALSPA GEM80-400 SERIES CONTROLLER TECHNICAL MANUAL Issue 3 04/99
The Standard Controller has space for eight I/O modules in the controller subrack
itself.
There are three address decoder switches located behind the power supply on
the upper backplane, as shown in Figure 3.1. Each switch has ten settings
numbered 0 to 9. Settings 0 to 7 select module addresses for specific subrack
slots. If a switch is not used it should be set to 8 or 9.
Setting the address of the I/O modules depends upon the type of Basic I/O
Module, i.e. 8-, 16-, or 32-point module.
Note... Each I/O address may only be used once, either for input, or output.
3.4.3.1.
8-Point Basic Modules
Note... GEM 80 uses 16 bit words. Each word may be a word of input or a word of
output, but not both. Therefore 8-point modules must be installed in pairs of
input modules or pairs of output modules.
The I/O subrack accepts 8-point modules in any slot as all slots are user
addressable. A decoder switch, S1 or S2, selects the addresses for a group of
four adjacent 8-point modules. S1 selects addresses for slots 1, 2, 3 and 4, and S2
selects addresses for slots 5, 6, 7 and 8.
Table 3.2 shows how the switch settings control the slot addresses.
Table 3.2 - 8-Point Basic Module I/O Slot Addresses Determined by Switch
Settings
Slots Controlled by S2 Slots Controlled by S1
8 7 6 5 4 3 2 1
S1/S2
Setting
Resulting Address of I/O
Module in Slot
Resulting Address of I/O
Module in Slot
0
1 1 0 0 1 1 0 0
1
3 3 2 2 3 3 2 2
2
5 5 4 4 5 5 4 4
3
7 7 6 6 7 7 6 6
4
9 9 8 8 9 9 8 8
5
11 11 10 10 11 11 10 10
6
13 13 12 12 13 13 12 12
7
15 15 14 14 15 15 14 14
Bits
8..15 0..7 8..15 0..7 8..15 0..7 8..15 0..7
3.4.3.2.
16-Point Basic Modules
16-point modules, located in slots 1 to 6, are allocated addresses according to
the setting of the three address decoder switches S1, S2 and S3. Modules
located in the highest numbered slots are fixed at addresses 6 and 7.