Motorola V186 - Cell Phone - GSM System Planner Manual page 18

When the DI module is in DC mode, each input has a HW input filter to make sure that
the input reading is stable. The range of the HW DI filter is 0 to 50.8 millisecond (in 0.2
mS steps). The Fast Counter DI filter range is 0 to 12.75 millisecond (in 0.05 mS steps).
The DI module features which can be configured are listed in the table below. Some
parameters are per module and some are per input.
Feature Parameter
Settings
DC or AC AC/DC
∗
operation
Fast Capture Disabled
/Enabled
DI Filter (DC) 0-254 (x 0.2
mS)
Counter Filter 0-255 (x 0.05
(DC) mS)
Event Time Disabled/
Tagging Enabled
Keep Last Value KLV/PDV
and Predefined PDV=0/1
Value
Mask No /Yes
Note: In the 120/230V DI module, the minimum effective DI Filter parameter value is 7.0
mSec.
Each DI can be set in the user application program's 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.
Each input can be configured to "Keep Last Value" (KLV) or to "Predefined Value"
(PDV 0 or 1). This value is shown to the user application program in the event of DI
module failure. The PDV can also be used during normal operation to force a value that
masks the actual input value. In this case the user program will get the PDV instead of the
actual input value.
∗
in Fast 24V IEC TYPE II modules –only DC
Default Setting Per Module/
Input
DC Module
Disabled Input
50 (10 mS) Module
20 (1 ms) Module
Disabled Input
KLV Input
No Input
14
Digital Input Modules
Parameter Setup
Location
STS site
configuration
STS site
configuration
STS site
configuration;
'C' User Program
STS site
configuration
'C' User Program
User Program I/O
link table
User Program I/O
link table
User Program I/O
link table