Carrier i-Vu MPC Open XP IO48/816 Installation manual

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CARRIER CORPORATION ©2017
A member of the United Technologies Corporation family · Stock symbol UTX · Catalog No. 11-808-431-01 · 6/20/2017

Verify that you have the most current version of this document from www.hvacpartners.com or your local Carrier
office.
Important changes are listed in Document revision history at the end of this document.
CARRIER CORPORATION ©2017. All rights reserved throughout the world. i-Vu is a registered trademark of Carrier
Corporation. All other trademarks are the property of their respective owners.

Contents
Introduction.................................................................................................................................................................. 1
What are the MPC Open XP and MPC Open XPIO expanders? .....................................................................1
MPC Open XP specifications...............................................................................................................................3
MPC Open XPIO48 and MPC Open XPIO816 specifications..........................................................................5
Safety considerations...........................................................................................................................................6
Installing the MPC Open XP........................................................................................................................................ 7
Mounting the MPC Open XP................................................................................................................................7
Wiring the MPC Open XP for power ...................................................................................................................7
To wire for power................................................................................................................................... 8
Addressing the MPC Open XP.............................................................................................................................8
Wiring for communications.................................................................................................................................9
Wiring specifications for BACnet MS/TP and ARC156........................................................................ 9
To wire the controller to the network ................................................................................................... 9
Installing an MPC Open XPIO expander......................................................................................................... 10
To mount an expander........................................................................................................................11
To wire the expander for power..........................................................................................................12
To attach MPC Open XPIO expanders ................................................................................................12
To set expander's address..................................................................................................................13
Wiring inputs and outputs ................................................................................................................................ 13
Inputs ...................................................................................................................................................13
Input wiring specifications ..................................................................................................................14
Outputs ................................................................................................................................................15
Output wiring specifications ...............................................................................................................15
To wire inputs and outputs .................................................................................................................16
To use the Auto-Off-On switches ........................................................................................................19
Wiring devices to the MPC Open XP's Rnet port........................................................................................... 19
Rnet wiring specifications...................................................................................................................20
ZS sensor overview .............................................................................................................................21
SPT sensor overview ...........................................................................................................................21
To wire the ZS or SPT sensor to the MPC Open XP ...........................................................................22
Wireless sensor overview ...................................................................................................................23
To install the Wireless Adapter for wireless sensors.........................................................................23
To wire an Equipment Touch to the MPC Open XP............................................................................25
Installing the MPC Open XP into an i-Vu® Control System......................................................................... 26
Local access to the MPC Open XP............................................................................................................................28
Troubleshooting .........................................................................................................................................................29
MPC Open XP LED's........................................................................................................................................... 29
Expander LED's .................................................................................................................................................. 30
To restore factory defaults ............................................................................................................................... 31
To get the serial number .................................................................................................................................. 31
To replace the MPC Open XP's battery........................................................................................................... 31
To replace the fuse............................................................................................................................................ 32
Compliance ................................................................................................................................................................34
FCC Compliance................................................................................................................................................. 34
CE Compliance ................................................................................................................................................... 34
BACnet Compliance........................................................................................................................................... 34
Appendix A: MPC Open XP wire lists........................................................................................................................35
MPC Open XP wire list....................................................................................................................................... 36
MPC Open XPIO48 wire list.............................................................................................................................. 38
MPC Open XPIO816 wire list ........................................................................................................................... 40
Document revision history ........................................................................................................................................43

MPC Open XP
MPC Open XP IO48/816 Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide All rights reserved
1
What are the MPC Open XP and MPC Open XPIO expanders?
The Multipurpose Controller Open XP (MPC Open XP - #OPN-MPCXP) provides monitoring and control for a variety
of HVAC system applications. The MPC Open XP supports multiple I/O configurations for both common and
custom HVAC control and connects to up to 20 field points directly (8 outputs and 12 inputs).
Introduction

Introduction
MPC Open XP
MPC Open XP IO48/816 Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide All rights reserved
2
The MPC Open XPIO48 (#OPN-MPCXPIO48) and MPC Open XPIO816 (#OPN-MPCXPIO816) are expanders that
connect to the expandable MPC Open XP to increase the number of inputs and outputs. To add inputs or outputs
to the MPC Open XP, you can attach up to 3 expanders, using any combination of MPC Open XPIO48 and/or MPC
Open XPIO816 expanders connected to the Xnet.

Introduction
MPC Open XP
MPC Open XP IO48/816 Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide All rights reserved
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MPC Open XP specifications
Driver
drv_mpcxpopen_vanilla_x-xxx-xxx
Maximum number of control
programs*
999
Maximum number of
BACnet objects*
12000
Maximum number of third-
party integration points
using Snap*†
200
* Depends on available memory
† BACnet third-party integration points are not counted.
* Depends on available
memory
†BACnet third-party
integration points are
unlimited
Power
24 Vac ±10%, 50–60 Hz
50 VA power consumption
26 Vdc (25 V min, 30 V max), 23 W
Single Class 2 source only, 100 VA or less
BACnet port
For communication with the controller network using BACnet ARC156 (156
kbps) or BACnet MS/TP (9600 bps – 76.8 kbps)
Rnet port
Supports:
•Up to 15 ZS sensors (5 per control program)
•One Wireless Adapter that communicates with up to 15 Wireless sensors
•One Equipment Touch
•Up to 4 SPT Standard sensors and one SPT Plus, SPT Pro, or SPT Pro-F
sensor
NOTE ZS sensors, a Wireless Adapter, and an Equipment Touch can share the
Rnet, but not SPT sensors.
Local Access port
For system start-up and troubleshooting using Field Assistant or an Equipment
Touch device
Xnet Remote Expansion port
For communication with expanders MPC Open XPIO48 and/or MPC Open
XPIO816. Up to 3 expanders with a maximum of 92 points between the MPC
Open XP and the expanders.
Inputs
12 inputs, configurable for 0–5 Vdc, 0–10 Vdc, 0–20 mA, RTD, thermistor, or dry
contact
Input resolution
14 bit A/D
Input pulse frequency
40 pulses per second. Minimum pulse width (on or off time) required for each
pulse is 12.5 msec.
Outputs
8 outputs for 24 Vdc relay driver, 0–10 Vdc, or 0-20 mA. Does not support dry
contact output channels.
Output resolution
12 bit D/A

Introduction
MPC Open XP
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Memory
16 MB non-volatile battery-backed RAM (with 12 MB available for use), 8 MB
Flash memory, 32-bit memory bus
Real-time clock
Battery-backed real-time clock keeps track of time in event of power failure
Battery
10-year Lithium CR123A battery ensures the following data is retained for a
maximum of 720 hours during power outages:
•Time
•Graphics
•Control programs
•Editable properties
•Schedules
•Trends
To conserve battery life, you can set the driver to turn off battery backup after a
specified number of days and depend on the archive function to restore data
when the power returns.
A low battery is indicated by the Battery Low LED or a low battery alarm in the i-
Vu® application, a touchscreen device, and Field Assistant.
Protection
Incoming power - replaceable 3 Amp Pico®fuse
Network connections - non-replaceable internal solid-state polyswitches reset
themselves when fault clears
Power, network, I/O connections - protected against voltage transient and surge
events
BT485 connector
You can install a BT485 (#BT485 - sold separately) to an MPC Open XP at the
beginning and end of a network segment to add bias and to terminate a network
segment.
Status indicators
LED's indicate status of communications and low battery status. Seven segment
display indicates running, error, and power status.
Environmental operating
range
0 to 140° F (-18 to 60°C), 0 to 90% relative humidity, non-condensing
Storage temperature range
-24 to 140°F (-30 to 60°C), 0 to 90% relative humidity, non-condensing
Physical
Rugged aluminum cover, removable screw-type terminal blocks
Overall dimensions
A:
B:
11-5/16 in. (28.7 cm)
7-1/2 in. (19 cm)

Introduction
MPC Open XP
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Mounting dimensions
C:
D:
E:
F:
10-7/8 in. (27.6 cm)
1-1/4 in. ( 3.2 cm)
2-1/2 in. ( 6.4 cm)
1/4 in. (.6 cm)
Depth
1-7/16 in. (3.7 cm)
Weight
1.7 lbs (0.8 kg)
BACnet support
Conforms to the BACnet Building Controller (B-BC) Standard Device Profile as
defined in ANSI/ASHRAE Standard 135-2012 (BACnet) Annex L, Protocol
Revision 9
Listed by
UL-916 (PAZX), cUL-916 (PAZX7), FCC Part 15-Subpart B-Class A
MPC Open XPIO48 and MPC Open XPIO816 specifications
Power
MPC Open XPIO48
24 Vac ±10%, 50–60 Hz
40 VA power consumption
26 Vdc (25 V min, 30 V max), 21 W
Single Class 2 source only, 100 VA or less
MPC Open XPIO816
24 Vac ±10%, 50–60 Hz
45 VA power consumption
26 Vdc (25 V min, 30 V max), 21 W
Single Class 2 source only, 100 VA or less
Inputs
MPC Open XPIO48
8 inputs, configurable for 0–5 Vdc, 0–10 Vdc, 0–20 mA, RTD, thermistor, or dry
contact
MPC Open XPIO816
16 inputs, configurable for 0–5 Vdc, 0–10 Vdc, 0–20 mA, RTD, thermistor, or dry
contact
Input resolution
14 bit A/D
Input pulse frequency
40 pulses per second. Minimum pulse width (on or off time) required for each
pulse is 12.5 msec.
Outputs
MPC Open XPIO48
4 outputs for 24 Vdc relay driver, 0–10 Vdc, or 0-20 mA
MPC Open XPIO816
8 outputs for 24 Vdc relay driver, 0–10 Vdc, or 0-20 mA
Output resolution
12 bit D/A
Microprocessor
8-bit microprocessor with 60 kB Flash memory, 2 kB SRAM, and CAN controller

Introduction
MPC Open XP
MPC Open XP IO48/816 Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide All rights reserved
6
Protection
Incoming power - 2 replaceable 3 Amp Pico®fuses
Power, network, I/O connections - protected against voltage transient and surge
events
Status indicators
LED's indicate status of communications, running, errors, and outputs
Environmental operating
range
-20 to 140°F (-29 to 60°C), 10–90% relative humidity, non-condensing
NOTE Install in a UL Listed enclosure only.
Storage temperature range
-24 to 140°F (-30 to 60°C), 0 to 90% relative humidity, non-condensing
Physical
Rugged aluminum cover, removable screw-type terminal blocks
Overall dimensions
A:
B:
9 in. (22.9 cm)
4-13/16 in. (12.2 cm)
Mounting dimensions
(in a panel)
C:
D:
E:
F:
8-5/8 in. (21.8 cm)
1 in. (2.5 cm)
2-13/16 in (7.1 cm)
1/4 in. (.6 cm)
Depth
1-7/16 in. (3.7 cm)
Weight
13.3 oz. (.377 kg)
Listed by
UL-916 (PAZX), cUL-916 (PAZX7), FCC Part 15-Subpart B-Class A, CE
Safety considerations
WARNING Disconnect electrical power to the MPC Open XP before wiring it. Failure to follow this warning
could cause electrical shock, personal injury, or damage to the controller.

Installing the MPC Open XP
MPC Open XP
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7
To install the MPC Open XP:
1 Mount the controller (page 7).
2 Wire the controller for power (page 7).
3 Set the controller's address (page 8).
4 Wire the controller to the BACnet MS/TP or BACnet ARC156 network (page 9).
5 Wire expanders to the controller (page 10).
6 Wire inputs and outputs (page 13).
7 Wire devices to the Rnet port (page 19).
Mounting the MPC Open XP
WARNING
When you handle the MPC Open XP:
•Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material.
•Do not touch components or leads.
•Handle the board by its edges.
•Isolate from high voltage or electrostatic discharge.
•Ensure that you are properly grounded.
Screw the MPC Open XP into an enclosed panel using the mounting slots on the cover plate. Leave about 2 in. (5
cm) on each side of the controller for wiring. See mounting dimensions in Specifications.
If using expanders, see Installing an expander (page 10) before mounting the controller.
Wiring the MPC Open XP for power
WARNING Do not apply line voltage (mains voltage) to the controller's ports and terminals.
CAUTIONS
•The MPC Open XP is powered by a Class 2 power source. Take appropriate isolation measures when
mounting it in a control panel where non-Class 2 circuits are present.
•Carrier controllers can share a power supply as long as you:
•Maintain the same polarity.
○Use the power supply only for Carrier controllers.
Installing the MPC Open XP

Installing the MPC Open XP
MPC Open XP
MPC Open XP IO48/816 Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide All rights reserved
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To wire for power
1 Turn off the MPC Open XP's power switch to prevent it from powering up before you can verify the correct
voltage.
2 Remove primary power from the 24 Vac transformer.
3 Pull the screw terminal connector from the controller's power terminals labeled Return and 24 Vac/26 Vdc.
4 Connect the transformer wires to the screw terminal connector.
5 Apply primary power to the transformer.
6 Measure the voltage at the controller's power screw terminal connector to verify that the voltage is within the
operating range of 21.6 - 26.4 Vac.
7 Insert the screw terminal connector into the controller's power terminals.
8 Turn on the MPC Open XP's power switch.
9 Verify that the Power LED is on and the Run LED is blinking.
Addressing the MPC Open XP
The MPC Open XP's two rotary switches determine its MAC address when it is placed on a BACnet MS/TP network.
The rotary switches define the MAC address portion of the device's BACnet address, which is composed of the
network address and the MAC address.
1 Turn on the controller's power.
2 Using the rotary switches, set the controller's address. Set the Tens (10's) switch to the tens digit of the
address, and set the Ones (1's) switch to the ones digit.
EXAMPLE If the controller’s address is 25, point the arrow on the Tens (10's) switch to 2 and the arrow on
the Ones (1's) switch to 5.
10's
1's
1
3
4
5
2
7
8
9
6
0
1
3
4
5
2
7
8
9
6
0
3 Turn on the controller's power.
NOTE The controller reads the address each time you apply power to it.
CAUTION The factory default setting is 00 and must be changed to successfully install your MPC Open XP.

Installing the MPC Open XP
MPC Open XP
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Wiring for communications
The MPC Open XP communicates using BACnet on the following types of network segments:
•MS/TP communicating at 9600 bps, 19.2 kbps, 38.4 kbps, or 76.8 kbps
•ARC156 communicating at 156 kbps
NOTE For more networking details, see the Open Controller Network Wiring Installation Guide.
Wiring specifications for BACnet MS/TP and ARC156
Cable:
22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
Maximum length:
2000 feet (610 meters)
WARNING Do not apply line voltage (mains voltage) to the controller's ports and terminals.
To wire the controller to the network
1 Pull the screw terminal connector from the controller's power terminals labeled 24 Vac/26 Vdc and Return
(Ground).
2 Check the communications wiring for shorts and grounds.
3 Connect the communications wiring to the controller’s screw terminals labeled Net +, Net -, and Shield.
NOTE Use the same polarity throughout the network segment.
4Set the communication type and baud rate.
For...
Set BACnet Mode jumper to...
Set DIP switches 7 and 8 to...
MS/TP
BACnet MS/TP
The appropriate baud rate. See the BACnet MS/TP
Baud diagram on the controller.
ARC156
BACnet ARC156
N/A. Baud rate will be 156 kbps regardless of the DIP
switch settings.
NOTE Use the same baud rate for all controllers on the network segment.
5 Wire the controllers on a BACnet MS/TP or BACnet ARC156 network segment in a daisy-chain configuration.
6 Install a BT485 on the first and last controller on a network segment to add bias and prevent signal
distortions due to echoing.

Installing the MPC Open XP
MPC Open XP
MPC Open XP IO48/816 Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
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7 Insert the power screw terminal connector into the MPC Open XP's power terminals.
8 Turn on the MPC Open XP's power.
9 Verify communication with the network by viewing a Module Status report in the i-Vu® interface.
See the Open Controller Network Wiring Guide for more details.
Installing an MPC Open XPIO expander
To install the MPC Open XPIO48 and/or the MPC Open XPIO816:
1 Mount the expander (page 11).
2 Wire the expander for power (page 12).
3 Attach the expander (page 12).
4 Address the expander (page 13).
5 Wire inputs and outputs (page 13).

Installing the MPC Open XP
MPC Open XP
MPC Open XP IO48/816 Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide All rights reserved
11
To mount an expander
WARNING
When you handle the expander:
•Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material.
•Do not touch components or leads.
•Handle the board by its edges.
•Isolate from high voltage or electrostatic discharge.
•Ensure that you are properly grounded.
Wiring restrictions for connecting the expander to the MPC Open XP
○Maximum length: 100 feet (30 meters)
○22 or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
You can mount the expander in one of the following locations:
•On top of a MPC Open XP, using the two allen cap screws provided. Connect Gnd to Gnd, Xnet-to Xnet-,
Xnet+ to Xnet+.
•Beside the MPC Open XP, by screwing the expander into an enclosed panel using the mounting slots on the
coverplate. Leave about 2 in. (5 cm) on each side of the expander for wiring. Mounting hole dimensions 1.5"
from the left (width) by 10.2" (height). Connect Gnd to Gnd, Xnet-to Xnet-, Xnet+ to Xnet+. You can mount the
expander up to 100 ft away from the controller.

Installing the MPC Open XP
MPC Open XP
MPC Open XP IO48/816 Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide All rights reserved
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To wire the expander for power
CAUTIONS
•The expanders are powered by a Class 2 power source. Take appropriate isolation measures when mounting
it in a control panel where non-Class 2 circuits are present.
•For the MPC Open XP to recognize an attached expander, you must turn on the expander before you turn on
the controller.
1 Verify that the expander's power switch is in the Off position.
2 Connect the 24 Vac power source to the 24 Vac/26 Vdc and Return terminals, being sure to maintain proper
polarity if power is being shared.
3 Turn on the expander's power switch.
4 Verify that the expander's Power LED is on and the Run LED is blinking.
To attach MPC Open XPIO expanders
1 Wire the MPC Open XP's Xnet Remote Expansion port to the same port on the expander.
Connect:
○Gnd to Gnd
○Xnet- to Xnet-
○Xnet+ to Xnet+
NOTE To use more than one expander, wire their Xnet Remote Expansion ports together in a daisy-chain
configuration. The MPC Open XP must be the first device on the expander network.
2 Set the Xnet baud rate to 500 kbps in the i-Vu® interface on the driver's Xnet page.
3 If the expander network has more than one expander, place the Term jumper in the down position or remove
it from all expanders except the one at the end of the expander network. The Term jumper must be in the up
position on the expander at the end of the network.

Installing the MPC Open XP
MPC Open XP
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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
Description
Thermistor 1
Precon type 2 (10 kOhm at 77°F). Input voltages should be from 0.489 Vdc to 3.825 Vdc
for thermistors.
Dry contact
A 5 Vdc wetting voltage detects contact position, resulting in a 1 mA maximum sense
current when the contacts are closed.
0–5 Vdc
0–10 Vdc
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.

Installing the MPC Open XP
MPC Open XP
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Signal Type
Description
0–20 mA
The input resistance on the positive (+) terminal is 250 Ohms. The Aux Power Out
connector is capable of supplying 24 Vdc to multiple 4–20 mA transducers, but the total
current demanded must not exceed 200 mA. If the voltage measured from the Aux Power
Out connector to Gnd is less than 18 Vdc, you need to use an external power supply.
RTD 1
Platinum - 1 kOhm at 32°F (0°C)
Nickel/Iron - 1 kOhm at 70°F (21°C)
Balco TS8000 - 1 kOhm at 70°F (21°C)
Input voltages should be from 0.6–1.2 V
NOTE For improved accuracy, Carrier recommends using an external current transducer-
type RTD, when RTD's are required with the MPC Open XP. Be aware that milliamp-type
sensors require different jumper settings and different wiring arrangements.
Pulse counter 2
Pulse counting up to 40 pulses per second.
Minimum pulse width (on or off time) required for each pulse is 12.5 msec.
1To use a thermistor or RTD not listed above, you can set up a custom translation table for your sensor.
2The MPC Open XP can perform pulse counting for dry contact or voltage inputs if you assign the input to a Pulse
to Analog Input microblock.
NOTE If you have one or more RTD's connected to the inputs, the total current draw of all Thermistor, RTD, and
Dry contact devices wired to the inputs should not exceed 10 mA. Exceeding this limit affects the accuracy of the
RTD's. Use the following approximations as a reference:
•10 kOhm Thermistor draws approximately 0.334 mA.
•1 kOhm RTD draws approximately 0.834 mA.
•Dry contact draws approximately 1 mA.
For example, if using an expander with 12 RTD's connected to the inputs, the remaining 4 inputs cannot be used.
This assumes negligible wiring impedance (<10 Ohms) for each RTD input, with up to 100 feet of 22 AWG cable.
Input wiring specifications
Input
Maximum length
Minimum gauge
Shielding
0–5 Vdc
0–10 Vdc
500 feet
(152 meters)
22 AWG
100 feet Unshielded
100 - 500 feet Shielded
0–20 mA
1000 feet
(305 meters)
22 AWG
100 feet Unshielded
100 - 1000 feet Shielded
Thermistor
Dry contact
Pulse counter
TLO
500 feet
(152 meters)
22 AWG
100 feet Unshielded
100 - 500 feet Shielded
RTD
100 feet
(30 meters)
22 AWG
Shielded
ZS or SPT sensors
500 feet
(152 meters)
18 AWG
22 AWG
Shielded or
unshielded

Installing the MPC Open XP
MPC Open XP
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Input
Maximum length
Minimum gauge
Shielding
Wireless Adapter for
Wireless sensors
500 feet
(152 meters)
22 AWG
Shielded or
unshielded
Equipment Touch
device
500 feet
(152 meters)
22 AWG (7x0096) bare
copper
If shielded, Aluminum/Mylar
shield (100% coverage) with TC
drain wire
Outputs
The MPC Open XP and expanders have universal outputs that you can use as binary outputs or analog outputs.
The outputs support:
•driving external 24 Vdc relays
•0-10 Vdc devices
•0-20 mA devices
WARNING Binary outputs are powered, 24 Vdc channels. Dry contact binary outputs are not supported in
this product line. Do NOT apply 24 Vac to these universal outputs.
If output controls a...
Resistance to ground must be...
0–10 Vdc device
500 Ohms minimum
0–20 mA device
800 Ohms maximum
NOTES
•The device must share the same ground as the controller.
•The total output current from all outputs and the Aux Power Out connection must not exceed:
500 mA at 115°F
300 mA at 140°F
For temperatures above 115°F, use the following equation to calculate the total current at 8 mA per degree:
500mA - ((max. expected temp. - 115°F) * 8mA)
Output wiring specifications
To size output wiring, consider the following:
•Total loop distance from the power supply to the controller, and then to the controlled device
NOTEInclude the total distance of actual wire. For 2-conductor wires, this is twice the cable length.
•Acceptable voltage drop in the wire from the controller to the controlled device
•Resistance (Ohms) of the chosen wire gauge
•Maximum current (Amps) the controlled device requires to operate

Installing the MPC Open XP
MPC Open XP
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To wire inputs and outputs
WARNING Do not apply line voltage (mains voltage) to the controller's ports and terminals.
The following applies to the inputs and outputs on the MPC Open XP and expanders.
1 Verify that the MPC Open XP's power and communications connections work properly.
2 Turn off the MPC Open XP's power.
3 Connect the input wiring to the screw terminals on the controller or expander. See figure below.
NOTES
○Connect the shield wire to the GND terminal with the ground wire.
○For a loop-powered 4-20 mA sensor, wire the sensor's positive terminal to the +terminal on the MPC
Open XP's Aux Power Out connector. Wire the sensor's negative terminal to an input's +terminal.