Kingfisher Plus+ Hardware Manual
AI-10: 8 Channel High Impedance Analogue Input
Module
9.2.1 Overview
•
16 Bit resolution
•
3 kV field to logic isolation
•
Bipolar differential channels
•
24 V
DC
isolated DC output
•
AI-10: Current / Low Impedance Inputs
•
AI-10-V: High Impedance Voltage Inputs
•
10 ms (1 ms*) scan rate
•
Mains noise rejection*
*
AI-10 hardware version 2.x only
.
Unless explicitly noted, all hardware versions of AI-10 modules are described in this section.
The newer AI-10 v2.x modules can be recognised by the label on the side which indicates
the hardware version. If the version number is not printed on the label then the module is
v1.6 or older.
The AI-10-V modules (v1.x only) are identical to the AI-10 modules but have the 250
Ω
current sensing resistors disconnected. This increases the input impedance for each channel
to more than 1 M
Ω
which is suitably high for voltage transducers. Each channel has its own
current sensing resistor, so any combination of channels can be converted.
In order to modify AI-10 v1.x the current sensing resistors have to be physically
disconnected (either by lifting one pin or by complete removal of the resistor). The circuit
board resistors to change are: R64 to R71 (channels 1 to 8 correspondingly). It is
recommended that modules be returned to Semaphore for factory conversion if required. No
responsibility will be taken by Semaphore for damage caused to boards during modification
performed by clients.
The AI-10 v2.x has internal jumpers (shorting links) that allow the input to be configured for
either current or voltage measurement. If a jumper is installed (default) then the related input
is configured to measure current. If a jumper is removed then the related input is configured
to measure voltage. Note that the factory fitted jumpers are yellow in colour and of a higher
grade than commonly found. Use of other jumpers may result in degradation of
measurement accuracy and so should be avoided. Appropriate handling precautions have to
be observed to avoid ESD and other damage when removing or installing shorting links.
Hardware Manual Version 7.16
http://www.servelec-semaphore.com/
Page 137
