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Document: LT0273 MX4428 MXP Engineering / Technical Manual
Device Information and Programming
Issue 1.5 24 March 2006 Page 3-35
3.17 CIM800 CONTACT INPUT MODULE
3.17.1 GENERAL
The CIM800 Contact Input Module is suitable for interfacing voltage free contacts, e.g.
switches, relay contacts, flow switches, or non-indicating detectors. It has two inputs, the
state of which are ORed together to generate the point status. Therefore unused inputs must
be terminated with the EOL resistor.
The CIM800 may be used in normally open or normally closed configurations, and the
normally open configuration may or may not include short circuit fault monitoring. Refer to
Figure 3.5 for wiring topology.
The normal response time to an input change of state is 0 – 5 seconds, as each device is
polled at 5 second intervals by the MXP. If faster operation is required, interrupt operation
can be enabled. Interrupt operation allows a change to be signalled by the device so that the
MXP detects the change immediately, rather than waiting for the next poll of the device.
The CIM800 can only interrupt on “closing” contacts, and interrupt operation is only
applicable for normally open contacts. Transitions from closed to open will always require up
to 5 seconds to be recognised. Therefore it cannot be used for callpoints on NZ systems.
Fault supervision is provided by default with a 200Ω EOL resistor - open circuit fault in a
normally open configuration and short circuit fault in a normally closed configuration. In
addition the normally open configuration can be programmed to also generate fault on short
circuit. In this case only one alarm contact is allowed, a 100Ω resistor must be wired in
series with the alarm contacts, and the fault threshold must be specially programmed - set
Parameter 2 to 176.
Recognition of a fault condition takes about 30 seconds.
WARNING
DO NOT JOIN INPUT WIRING BETWEEN INPUTS OR MODULES OR TO ANYTHING
OTHER THAN VOLTAGE FREE CONTACTS
3.17.2 CIM800 SPECIFICATIONS
Dimensions Height: 61mm Width: 84mm Depth: 25mm
Weight 100g
Line Connections L-, L+
Supply Voltage 20V – 40V
Supply Current Standby Current : 275uA (typical)
LED on : 2.8mA (typical)
Contact Inputs Monitoring Voltage 5V
Line Resistance 10Ω max
EOL 200Ω + / - 5%.
Alarm Resistance 100Ω + / - 5% (if used).