Pepper Computer Modular Computers RS485 - Manual (Page 139)

Digital Modules
08 Jan. 98
SMART I/O User’s Manual
Page 4 - 53 Manual ID 09901, Rev. Index 0500
4.4 SM-ACI1
4.4.1 Introduction
The SM-ACI1 provides eight optoisolated 80 V AC to 264 V
AC inputs arranged in six independent groups with respect to
common neutral connections. The input frequency range is 47-
63 Hz, with the system registering a logical ’1’ when the input is
active. A logical ’0’ is returned when the input is no longer
active. However, a low-pass filter restricts signals exceeding the
filter limit, thus registering a logical ’0’ with the system.
The user interface is realized by eight green LEDs (one per input
channel), which switch on when the inputs are energized, and by
a configurable filter on the last channel used for INTx interrupts,
that can be mounted on the specific interrupt slots envisaged for
this purpose.