Motorola ACE3600 RTU, Руководство пользователя

Страница: 96 / 379

Digital Input Module
6-3
16 DI Module 32 DI Module
Figure 6-2 ACE3600 DI Module – Front Panel
DI Module Configuration
The 16 DI Fast 24V and 32 DI Fast 24V modules can handle AC and DC input signals. The
user can select DC or AC operation per module. When AC configuration is selected, the Fast
Capture, Counter Function and Input Filters (see below) are disabled. The 32 DI 48V modules
can handle DC input signals only.
Fast Capture (DC Configuration)
When the DI module is in DC mode, each DI can be configured as a Fast Capture DI. Fast
capture causes the SCAN ladder output operation to get the first change that occurred since the
previous scan. When fast capture is disabled, the scan gets the current value of the DI (in this
case, any DI changes between scans are missed.)
Input Filters (DC Configuration)
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).