When a fault occurs to a DSO card,it held the output signals to the previous value while the controller was healthy
when an error occurs to the DSO module while the controller was healthy , the module held the previous values of output channels . I need the module to de-energize all the output signals in case of failure. I appreciate ur suggestion.
Function code 128 selects the default values for all outputs associated with any type of DSO module. If the control module goes bad, then the outputs can be forced to the default values until the module can be replaced or repaired. The BCD output (function code 115) selects the failover to default settings for each group of eight outputs. Specification S2 of function code 115 defines the I/O module. If the hundreds digit of S2 equals logic 0, then the outputs go to the default values as configured by function code 128 on loss of the control module. Setting the hundreds digit to logic 1 holds the current output. Function code 128 provides default values for a maximum of two DSO modules. If one or both of the modules have eight outputs, then outputs one through eight are the default values, and outputs 9 through 16 remain unused.