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no
The Expansion module discovers the main
CPU (MCPU) via UDP/IP (broadcast).
no
obtained self and MCPU IP address?
1. Loads the Firmware Image into RAM from the MCPU (using TCP).
2. Turns off all LEDs and runs the loaded Expansion Firmware Image.
3. Auto-recognizes actual I/O modules.
Loads user files from the MCPU (using TCP) and saves in FLASH:
1. Configuration, if such exists
2. Application database, if such exists
3. Predefined input and output values and I/O link (if such exist)
4. Encryption files, if such exist
yes
Failed to load one or more files?
1. Registers its actual I/O modules information in the MCPU (using TCP).
2. Initializes the Expansion Image (system startup).
3. Negotiates Ethernet addresses (MAC) and starts EMI with the MCPU via TCP.
yes
Failed to negotiate or start EMI?
Running:
1. Monitor EMI communication with the MCPU.
2. Monitor the MCPU status via TCP.
3. Monitor actual I/O modules change (hot-swap) and update the MCPU.
yes
Has the MCPU restarted, or disconnected for
more than fail time (60 seconds)?
yes
Discovery succeeded-
yes
no
no
17-4
Expansion Module
Expansion
Loader
Expansion
Firmware
Image
no
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