Epec CAN Module Family
2024 CONTROL MODULE
15 / 34
07.10.2010
2024G08,G18 / MAN000185
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3.5 Digital Input / Analog Input
Pins X1.12, X2.12, X3.5…X3.8, X3.13, and X3.14 are analog inputs. Some of the inputs are
grouped: X3.5, X3.6 and X3.7 is defined as group one, and X3.13 and X3.14 is group two. Both
groups can be configured either as a current input or as a voltage input. For example, if group
two is configured as a current input, then both pins X3.13 and X3.14 can only be used as a
current input.
Pins of this kind are used to measure analog signals. They can be used as high impedance
voltage inputs for signals from 0 to 5 volts or low impedance current inputs for signals from 0 to
22,7 milliamperes. Pins of this kind can be used as e.g. joystick connection when 41 k +2,5 V
(voltage input) is selected.
Inputs are divided into groups by the input impedance configuration. The input impedance of
each group is controlled by a bit in an Input Impedance Configuration Register (IICR). This
register is invisible to the programmer but it can be written by HW_SET_AI_TYPE function call.
When an input like this is configured as a low impedance current input, it can’t
withstand the normal maximum input voltage rating. The maximum rating is lowered
in this case to 15 volts.
In PLCopen programming environment, there is a word variable in IW area associated with each
pin from where the software can read the actual signal magnitude at the pin.
In carefully selected applications these pins can also be used as digital inputs. Generally, it is
not recommended. In high impedance voltage input configuration they have low threshold
voltage which is quite sensitive to interference signals. In low impedance current input
configuration they are subject to damage if they are connected to for example 24 volt system
voltage. There are bits in IX area associated with these inputs to support the DI functionality.
Input Impedance Configuration Register (IICR)
Bit Input Group
IICR.0 X1.12
IICR.1 X2.12
IICR.2 X3: 5, 6, 7
IICR.3 X3.8
IICR.4 X3: 13, 14
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