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To set expander's address
You must give the expanders an address that is unique on the expander network.
1
If wired for power, turn off the expander's power and the attached MPC Open XP's power.
2
Set the expander's address on the rotary switch.
EXAMPLE If the controller's address is 2, point the arrow on the switch to 2.
NOTE The MPC Open XP can have a maximum of 3 expanders. You MUST address the expanders as 1, 2,
and 3. Higher addresses will not work.
3
Turn on the expander's power, then turn on the attached MPC Open XP's power. The MPC Open XP reads the
powered expander's address each time you turn on the MPC Open XP.
CAUTION The first time the controller communicates with an expander, it triggers a software download. This
may occur if the expander(s) are blank (not a normal condition) and in cases where the controller's driver has
been updated. During that time, the red Error LED and the green Run LED on the expander(s) flash in sequence.
This process may take several minutes to complete. Do not disconnect power or communications wiring during
this download.
Wiring inputs and outputs
WARNING Do not apply line voltage (mains voltage) to the controller's ports and terminals.
See Appendix A (page 35) to print a blank wire list.
Inputs
The MPC Open XP and expanders have universal inputs that accept the signal types described below.
Signal Type
Thermistor
1
Dry contact
0–5 Vdc
0–10 Vdc
MPC Open XP
MPC Open XP IO48/816
Installation and Start-up Guide
Description
Precon type 2 (10 kOhm at 77°F). Input voltages should be from 0.489 Vdc to 3.825 Vdc
for thermistors.
A 5 Vdc wetting voltage detects contact position, resulting in a 1 mA maximum sense
current when the contacts are closed.
The output impedance of a 0–5 Vdc or a 0–10 Vdc source must not exceed 200 Ohms.
The input impedance of the MPC Open XP is approximately 20 kOhm.
Carrier Proprietary and Confidential
13
Installing the MPC Open XP
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