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Is it possible to configure the SY/MAX model 400 controller to store previous HALT codes?



Yes. Register 8107 is a pointer register to a 16 register stack. If a value is entered in this register, the controller will use that register as the start of a stack of a 16 long stack of the last error codes contained in 8175 (i.e. if a value of 100 is placed in 8107, Registers S100-S115 will contain the last 16 HALT codes generated by the controller).