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Setting the Frame Number
The expansion module shipped from the factory is set by default to 1. If more than one I/O
expansion frame is added, this frame number (also known as frame ID) must be changed.
Procedure 17-1 describes how to set the expansion frame number using the rotary selector
switch on the front panel of the expansion module. The frame number should be changed
before powering up the module.
Procedure 17-1 How to Set the I/O Expansion Frame Number
1) Make sure that the expansion module is not connected to a power source.
2) Insert a small flat screwdriver into the groove on the rotary frame number selector. See
Figure 17-3.
3) Using the screwdriver, turn the dial until the arrow points to the desired frame number.
Note: The selected frame number must not already be assigned to another expansion
module and must be in the range of 1-13 (1-9, A, B, C, D hexadecimal.)
4) Connect the expansion module to a power source.
5) When the expansion module is powered up, verify the selected frame number via the four
binary Expansion Address (EXP ADDR) LEDs on the front panel. This is the frame
number that will be used when communicating with the main CPU.
Figure 17-3 Expansion Module Rotary Frame Number Selector Switch and
The rotary frame number selector switch should not be changed while the expansion
module is running. If the switch is changed while the expansion module is running,
D
C
B
Groove
A
9
8
Expansion Address LEDs
1
2
3
4
5
6
7
17-8
Expansion Module
EXP
ADDR
X1
X2
X4
X8
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