Installation CEI-220 Discrete Inputs
CEI-100/CEI-200/CEI-x20 User’s Manual 38
threshold and dividing by the LSB value from the Table 33, for your
chosen mode.
As you can see in Table 34, one value may be appropriate for various
modes. The logical value of the discrete inputs is returned from the
AR_GET_CONFIG API routine. The format is shown in Table 35.
Table 32. Typical Discrete Input Application
Input is driven to 0 Volts (Ground). Floats when not driven
such as a switch, relay closures with a pole tied to ground, or
an open collector driver. This mode handles wider voltage
ranges than CMOS/TTL Open Collector Mode. This
accommodates for large ground potential differences. The
CEI-220 provides a 47K pull-up resistor to the voltage
applied to the DISINHIn input.
Input is driven to a supply voltage. Floats when not driven.
This includes switches or relays with a pole tied to a supply
voltage.
Input is driven between a supply voltage and 0 Volts.
Input is driven by either a TTL or CMOS (5V or 3.3V) driver
Either an open collector or open drain logic device drives
input. The CEI-220 provides a 47K pull-up resistor to the
voltage applied to the DISINHIn input. The maximum
threshold is 4.98 Volts.
Table 33. CEI-220 Discrete Input Operating Modes Specification
Typical
Accuracy
(Percent
Full Scale)
Full Scale
Threshold
(Volts)
2,3,4
Typical
LSB
Value
(Volts)
1. Jumper installed by default.
2. Inputs protected to 100 Vdc.
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