7 Digital Inputs
The 5232 controller board has four Digital / Counter inputs i.e. all four digital inputs can also be
used as counter inputs. One digital input, the interrupt input, can also be used to wake up the
controller from sleep mode.
In addition, 16, 32 digital inputs or 32 universal digital inputs/outputs channels are available on the
integrated I/O module, if present. For example,
• The 5601/5601A I/O module provides 16 digital input channels.
• The 5604 I/O modules provide 32 universal digital input/output channels.
• The 5606 I/O module provides 32 digital input channels.
Refer to the hardware manual of your corresponding I/O module for wiring and configuration details
to of the I/O module digital input channels to field data. Wiring configuration or access of the
controller board digital input data is covered in the rest of this chapter.
7.1 Digital/Counter Inputs
The controller board has three Digital / Counter inputs. These inputs are labeled DIN/Counter 0, 1
and 2 on the P4 terminal connector. The DIN/Counter inputs have one standard voltage range, 24V
AC or DC, and operate as digital inputs and as counter inputs.
• For DC inputs the maximum input voltage is 30V and the minimum voltage to turn the input ON
is 10V.
• For AC inputs the maximum input voltage is 24Vrms and the minimum voltage to turn the input
ON is 10Vrms.
• For counter inputs the maximum frequency is 5 KHz with the filters off.
The DIN/Counter inputs can be used as both digital inputs and counter inputs in an application
program.
• For TelePACE applications use the CNTR Controller Counter Inputs register assignment to
read the DIN/Counter inputs as counters and the DIN Controller Digital Inputs register
assignment to read the DIN/Counter inputs as digital inputs
• For ISaGRAF applications use the cntrCtrl I/O connection to read the DIN/Counter inputs as
counters and the dinCtrl I/O connection to read the DIN/Counter inputs as digital inputs.
Each of the three DIN/Counter inputs on the controller has a switch selectable filter, which limits the
maximum input frequency. Filtering limits the maximum digital input or counter frequency to
approximately 30Hz. SW1 is used to enable or disable filtering. Refer to the section 11.5-
Configuration Switches for filter selection information using SW1.
Use a filter for 50 or 60Hz digital inputs and for low speed counting applications that experience
problems due to contact bounce.
Do not use filtering for high speed counting applications.
7.1.1 Wiring Examples
The figure below illustrates a wiring example where all DIN/COUNTERS channels are being used.
SCADAPack 32 Controller Hardware Manual
May 24, 2006
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