Kingfisher Plus+ Hardware Manual
IO-5: Combinational Analogue / Digital IO Module
14.4.1 Overview
•
4 analogue inputs
•
1 analogue output with open line detection
•
4 digital inputs
•
4 sinking solid state outputs
This module can be installed in any I/O slot of a 4, 6 or 12 slot backplane.
Analogue IO
Input protection for the module is sufficient to guarantee operation with reduced performance
with up to 1500 V common-mode. The module provides electrical isolation of externally
generated noise between field wiring and the backplane through the use of optical isolation.
To minimise the capacitive loading and noise, all field connections to the module should be
wired using a good grade of twisted, shielded instrumentation cable. The shields can be
connected to E. The E connection provides access to the backplane (frame ground).
Resolution of the converted signals is 12 bits binary (1 part in 4096). The sign bit is not used
in the conversion process. The placement of the bits within the data word is shown below.
MSB
LSB
0
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
Scaling of the input is shown below:
All inputs share a single common and all outputs share a separate common at the zero volt
rail.
For analogue outputs, an Open Line Detection circuit will indicate whether current loop is
open or closed. Please note that open line detection circuit performance cannot be
guaranteed when AO value is set to less than 1% (328 decimal) of full scale in the 0-20 mA
range.
Hardware Manual Version 7.16
http://www.servelec-semaphore.com/
Page 217
