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The appropriate combination is selected as the I/O module type, when configuring the I/Os in
the ACE3600 STS site configuration.
DI Fast Capture
Each DI can be configured as Fast Capture DI in the STS advanced I/O configuration. Fast
capture causes the SCAN ladder output operation to get the first change that occurred since the
previous scan. When fast capture is disabled (default), the scan gets the current value of the DI
(in this case DI changes between scans are missed).
DI Input Filters
Each inputs has a hardware input filter to make sure that the input reading is stable. The
hardware DI filter range is 0 to 50.8 mS (in 0.2 mS steps). Counter DI filter range is 0 to 12.75
mS (in 0.05 mS steps). The DI filter can be set in the STS advanced I/O configuration.
Note: In this module, the minimum effective filter value is 1 mS.
DI Event Time Tagging
Each DI can be set in the Application Programmer I/O link table to trigger recording of time
tagged events upon any input change of state. The time tagged events are recorded in the CPU
memory and can be retrieved for various purposes.
DI Keep Last Value (KLV) and Predefined Value (PDV)
Each input can be configured to KLV or to a PDV (0, 1) in the Application Programmer I/O
link table. This value is shown to the user application program in the event of DI module
failure. Also, the predefined value can be used during normal operation to force a value that
masks the actual input value. In this case the user application program will get the PDV
instead of the actual input value.
DO Keep Last Value (KLV) and Predefined Value (PDV)
Each output can be configured to KLV or to a PDV (0, 1). This value is executed when the
user application program stops or when the module has no communication with the CPU
module. Also, the predefined value can be used during normal operation to force a value on the
output by ignoring the user application program value.
DO/DI FET Module Configuration Options
The DO/DI FET module features which can be configured are listed in the table below. Some
parameters are per module and some are per input.
Digital Output/Digital Input FET Module
8-3
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