Kingfisher Plus+ Hardware Manual
IO-3: Combinational Analogue/Digital IO Module
14.2.1 Overview
• 4 SPST relay outputs
• 4 analogue inputs
• 4 digital inputs
• 1 analogue output
This module can be installed in any slot of a 4, 6 or 12 slot backplane.
Analogue IO
The IO-3 provides two signal ranges: 0 to 20 mA and 4 to 20 mA. The default range is
4 - 20 mA. A link on the rear of the module selects 4 - 20 mA (link installed) or 0 - 20 mA I/O
for all channels.
Resolution of the converted signals is 12 bits binary (1 part in 4096). The sign bit is not used
in the conversion process. All channels are updated four times per second (250 ms refresh
time). 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.
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).
Hardware Manual Version 7.16
http://www.servelec-semaphore.com/
Page 202
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