Bailey ABB NTAI05 Control Module
Slave Expander Bus Interface
The expander bus interface translates the 8-bit bidirectional expander bus into two 8-bit unidirectional internal busses; one input and one output. Information is communicated over the expander bus by sending either three or five bytes in sequence depending on the operation. The operations that the MFP can request from the DSM are: read module type status, read input states, write channel configuration, read channel and reset and read channel.
The expander bus interface receives an 8-bit module address from the MFP and compares it to the address set on S1. If the addresses match, then the module will respond to the bytes that follow. If the function code byte specifies a read operation, the interface will send the selected information from the output buffer.
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