Digital Status Inputs
Low Frequency Measurement
20 Channels per Module
Auxillery Alarm I/O
Fullt Individually Isolated Inputs
Low Speed Functions have Programmable Filtering Operation
LED Indicators for each channel
The 930 modules provide 20 channels of isolated digital inputs for status monitoring, counting and frequency measurement. Outputs are provided for local alarm announciation or supervisory control. This module is designed for low cost and is intended for applications where isolation of each input is important.
Digital modules support three auxillary digital outputs and a digital input. these can be used in combination to drive a local alarm indicator. An alarm outputs can be set by any channel in alarm within the group 1-10 and a second alarm output by any channel in alarm within the group 11-20. An alarm state(0 or 1) can be programmedfor each status channel. For counting inputs a high alarm canonly be specified. The digital output level of these two alarm outputs is suitable to drive small externally powered relays using an isolated supply.
. The third output is an isolated relay and can be used to drive an audio alarm. This alarm output can be 'Acknowledged' and cancelled by a contact closure connected to the digital. The output will switch again when any alarm channel error condition occurs.
Note: The two alarm outputs and the acknowledge inputs are not isolated from the RS485 communications port