8 Digital Outputs
The 5232 controller board provides a single digital (discrete) output channel which can be used to
indicate a controller alarm condition to an external. This chapter covers the controller board digital
output.
In addition, 12, 16 dry contact digital outputs or 32 universal digital inputs/outputs channels may be
available on the integrated I/O module. 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
of the I/O module digital output channels. Information on the controller board digital output is
covered in this rest of this chapter.
The controller board status output indicates an alarm condition to an external device. The output is
ON (capable of conducting current) during normal operation. The output is OFF (high impedance)
during the following conditions:
• Power failure.
• Controller board RESET.
• Application program defined conditions.
The status output is an optically isolated transistor. The polarity of the output must be observed. The
output current must be limited to 60mA during the ON condition. The output voltage must be limited
to 30V during the OFF condition.
8.1 Wiring Example
A typical application of this output is shown in Figure 9: STATUS Output Wiring. In this scenario,
STATUS is being used to energize a relay and the normally closed contacts of this relay are used to
activate an alarm. The relay in this application has a 24V coil with greater than 400Ω resistance.
Relay Coil
Specifications:
• 24V
• >400 ohms
34
+
ST A T –
NC NO COM
+
24 V
–
NC ALARM
CONTACTS:
closed during power
failures and fault
21 5 6 7 8
P4
Figure 9: STATUS Output Wiring
SCADAPack 32 Controller Hardware Manual
May 24, 2006
23
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