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MX4428 MXP Engineering / Technical Manual Document: LT0273
Device Information and Programming
Page 3-32 24 March 2006 Issue 1.5
3.16 MIM800 AND MIM801 MINI INPUT MODULES
3.16.1 GENERAL
The MIM800 and MIM801 Mini Input Modules are suitable for interfacing voltage free
contacts such as switches, relay contacts, flow switches, or non-indicating detectors.
Dedicated Manual Call Point products are available that have the MIM800 or MIM801
mounted on the back of an MCP. Refer to sections
3.18 and 3.19.
Both the MIM800 and MIM801 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 3.4 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.
To interrupt on closing contacts, the MIM800 is required. To interrupt on opening contacts,
the MIM801 is required. An interrupt can be generated on only the transition from normal to
alarm, transitions from alarm to normal will always require up to 5 seconds to be recognised.
Fault supervision is provided by 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 for a MIM800 and parameter 5 to 40 for a MIM801).
The input wiring should be limited to less than 10m in length and located well away from all
electrical noise sources.
Recognition of a fault condition takes about 30 seconds.
The MIM800 and MIM801 have screw terminals for an Alarm Indicator LED. No series
resistor is required. A current of about 2.5mA will be supplied when the LED is on.
WARNING
DO NOT JOIN INPUT WIRING BETWEEN MODULES OR CONNECT TO ANYTHING
OTHER THAN VOLTAGE FREE CONTACTS
3.16.2 MIM800 / MIM801 SPECIFICATIONS
Dimensions Height: 13mm Width: 48mm Depth: 57mm
Weight 22g
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 (MIM800 and all N/O) 10Ω max
Line Resistance (MIM801 N/C) 50Ω max