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4.0 OPERATING INSTRUCTIONS
All registers and memory, including the flag bytes are accessed as 16-bit data words on even
boundaries. The configuration registers are accessed in the A16 address space. The A16 base
address is a function of the logical address of the module. It can be computed as follows:
A16 Base Address = ( ) LA C
× +
64 000
16
The logical address has a range of 0 to 255. Any value, except 0 and 255 which are reserved for
slot 0 controllers and dynamic addressing, is valid. However, care should be taken not to set the
logical address the same as another module in the system. The most significant bit (MSB) has a
weighted value of 128 when the switch is in the off (1) position. The least significant bit has a
weighted value of 1 when the switch is in the off (1) position. The sum of the weighted values of
all the switches in the off position is the module logical address.
Relay operation is controlled by writing a '0' or '1' to the corresponding bit in the Relay
Control/Status registers detailed in Section 3.5.
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