Honeywell Excell 500/600 Controll System 500-XCL5010 - Manual (Page 29)

EXCEL 500/600 INSTALLATION INSTRUCTIONS
Fig. 60. XF526 Analog Input module connections
XF523A Digital Input Module
The digital input module can process DC or AC voltage
signals. The module has 12 digital inputs. When the input
voltage reaches 5 V, the digital signal is set to a status of "1".
With a hysteresis of 2.5 V, the digital input signal must fall
below 2.5 V before a digital status of "0" is reported.
Fig. 61. Digital input hysteresis
The LED functionality of each digital input channel can be
altered via 12 internal DIP switches. In the ON position
(default), the LED will illuminate when energized (normally
open contacts). In the OFF position, the LED will illuminate
when de-energized (normally closed contacts).
Max. signal voltage from non-Honeywell voltage sources:
DC Voltage: V
max
= 40 V
AC Voltage: V
max
= 28 V / ≥ 50 Hz
Input resistance:
R
i
= 15k ohms
Fig. 62. XF523A connection examples
If the inputs are used as totalizers, Table 9 applies.
Table 9. Totalizer inputs specifications
Input Frequency Pulse duration Pulse internal Chatter time
1, 2 max. 15 Hz min. 20 ms min. 33 ms max. 5 ms
3 to 12 max. 0.4 Hz min. 1.25s min. 1.25 s max. 50 ms
The inputs shown in row one (Input 1 to 2) may be used as fast totalizers. In this case, the input signal characteristics of row one
are valid. If they are not used as fast totalizers, the values of row two (Inputs 3 to 12) apply to them as well.
29 EN1R-1047GE51 R0902