FX-PCG26 General Purpose Programmable
Controller Installation Instructions
Application
The FX-PCG controller is part of the Facility Explorer® Programmable Controller (FX-PC) family.
These controllers run pre-engineered and user-programmed applications and provide the inputs
and outputs required to monitor and control a wide variety of HVAC and other facility equipment.
The FX-PCG controllers operate on an RS-485 BACnet® MS/TP Bus as BACnet Application Specific
Controllers (B-ASCs) and integrate into Johnson Controls® and third-party BACnet systems.
The FX-PCG controller is available with or without an integral LCD and push button user interface.
Switchable communications protocols
The FX-PC Family Controllers and network sensors communicate using the standard BACnet
protocol, based on the ANSI/ASHRAE 135-2008. The BACnet protocol is a standard for ANSI,
ASHRAE, and the International Standards Organization (ISO) for building controls.
FX-PCG, FX-PCX, and FX-PCV Field controllers are BTL-listed as BACnet Application Specific
Controllers (B-ASCs). FX-PCA field controllers and the PCV1930 Field Controller are BTL-listed as
BACnet Advanced Application Controllers (B-AACs). The NS Series Sensors are BTL-listed as BACnet
Smart Sensors (B-SSs).
Release 10.1 of the Controller Configuration Tool (CCT) 13.0 and later can be used to switch the
Field Bus communications protocol in supported FX-PC Controllers to be either the standard
BACnet MS/TP or the N2 protocol. All new controllers use either BACnet MS/TP as the default
communications protocol, or BACnet/IP. Switchable communications protocols in the MS/TP
models provide a cost-effective upgrade and modernization path for customers with existing N2
controllers.
The Modernization Guide for Legacy N2 Controllers (LIT-12012045) and the controller-specific
documentation provide installation and commissioning support and include tips for efficient
and safe replacement. Refer to the N2 Compatibility Options chapter of the Controller Tool
Help (LIT-12011147) for information about mapping N2 Objects in controllers with switchable
communications protocols.
The N2-capable FX-PC Controllers can be used as functional replacements for legacy N2 controllers.
The N2-capable FX-PC Controllers:
• have the I/O quantities and characteristics of the FX-PC family controllers
• must be programmed with CCT which has programming capabilities that are similar (but not
identical) to HVACPro, GX9100, GPL, and other legacy tools
• support SA Bus devices
• support FX-WRZ wireless sensors from the controller using the FX-WRZ7860 receiver when
configured for BACnet MS/TP communication
The N2-capable FX-PC controllers:
• do not support Zone Bus (for example, TMZ sensors and M100 actuators)
• do not support passthrough in the commissioning mode
• do not support remote downloading or commissioning using BACnet routing
• do not support wireless connection to the N2 bus
Part No. 24-10143-160 Rev G
2019-03-22
*2410143144G*
(barcode for factory use only)
FX-PCG2611-x, FX-PCG2621-x
North American Emissions Compliance
Canada
This Class (A) digital apparatus meets all the requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de la Classe (A) respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
United States
This equipment has been tested and found to comply with the limits for a Class A digital device
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when this equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful interference to
radio communications. Operation of this equipment in a residential area may cause harmful
interference, in which case the users will be required to correct the interference at their own
expense.
Installation
Observe these guidelines when installing an FX-PCG controller:
• Transport the controller in the original container to minimize vibration and shock damage.
• Verify that all parts shipped with the controller.
• Do not drop the controller or subject it to physical shock.
Parts included
• One FX-PCG controller with removable terminal blocks (Power, SA bus, and FC bus are removable)
• One installation instructions sheet
Materials and special tools needed
• Three fasteners appropriate for the mounting surface (M4 screws or #8 screws)
• One 20 cm (8 in.) or longer piece of 35 mm DIN rail and appropriate hardware for DIN rail mount
(only)
• Small straight-blade screwdriver for securing wires in the terminal blocks
Mounting
Observe these guidelines when mounting an FX-PCG controller:
• Ensure the mounting surface can support the controller, DIN rail, and any user-supplied
enclosure.
• Mount the controller horizontally on 35 mm DIN rail whenever possible.
• Mount the controller in the proper mounting position.
FX-PCG26 General Purpose Programmable Controller Installation Instructions2
• Mount the controller on a hard, even surface whenever possible in wall-mount applications.
• Use shims or washers to mount the controller securely and evenly on the mounting surface.
• Mount the controller in an area free of corrosive vapors and observe the Ambient Conditions
requirements. See Technical specifications.
• Provide for sufficient space around the controller for cable and wire connections for easy cover
removal and good ventilation through the controller (50 mm [2 in.] minimum on the top, bottom,
and front of the controller).
• Do not mount the controller on surfaces prone to vibration, such as duct work.
• Do not mount the controller in areas where electromagnetic emissions from other devices or
wiring can interfere with controller communication.
Observe these additional guidelines when mounting an FX-PCG controller in a panel or enclosure:
• Mount the controller so that the enclosure walls do not obstruct cover removal or ventilation
through the controller.
• Mount the controller so that the power transformer and other devices do not radiate excessive
heat to the controller.
• Do not install the controller in an airtight enclosure.
Figure 1: FX-PCG2621 mounting positions
DIN rail mount applications
Mounting the FX-PCGCH-PCG horizontal on 35 mm DIN rail is the preferred mounting method.
To mount a controller on 35 mm DIN rail:
1. Securely mount a 20 cm (8 in.) or longer section of 35 mm DIN rail horizontal and centered in
the appropriate location so that the controller mounts in the horizontal position. .
2. Pull the two bottom mounting clips outward from the controller to the extended position. See
Figure 1
3. Hang the controller on the DIN rail by the hooks at the top of the (DIN rail) channel on the back
of the controller, and position the controller snugly against the DIN rail. See on page .
4. Push the bottom mounting clips inward (up) to secure the controller on the DIN rail.
To remove the controller from the DIN rail, pull the bottom mounting clips out to the extended
position and carefully lift the controller off the DIN rail.
3FX-PCG26 General Purpose Programmable Controller Installation Instructions
Wall mount applications
To mount an FX-PCG directly on a wall or other flat vertical surface:
1. Pull the two bottom mounting clips outward and ensure they are locked in the extended
position as shown in Figure 2.
2. Mark the mounting hole locations on the wall using the dimensions in Figure 2 and one of the
mount positions shown in Figure 1. Or hold the controller up to the wall or surface in a proper
mount position and mark the hole locations through the mounting clips.
3. Drill holes in the wall or surface at the marked locations, and insert appropriate wall anchors in
the holes (if necessary).
4. Hold the controller in place, and insert the screws through the mounting clips and into the
holes (or anchors). Carefully tighten all of the screws.
Important: Do not overtighten the mounting screws. Overtightening the screws may
damage the mounting clips.
Mounting features and dimensions
Figure 2: Back of Controller showing extended mounting
clips, DIN rail channel, and mounting dimensions, mm (in.)
FX-PCG26 General Purpose Programmable Controller Installation Instructions4
FX-PCG2621 physical features
Figure 3: FX-PCG2621 physical features
Table 1: FX-PCG2621 physical features
Callout Physical feature: description and references
1 Binary Outputs - 24 VAC triacs
2 Binary Output Source Power Selection Jumpers - Live 24 VAC on Exposed Jumper
Pins
3 Device Address DIP Switch Block
4 Configurable Outputs - can be defined as: Voltage Analog Output (0-10 VDC), Binary
Output (24 VAC Triac)
5 Analog Outputs - can be defined as: Voltage Analog Output (0-10 VDC), Current
Analog Output (4-20 mA)
6 24 VAC, Class 2 Supply Power - Terminal Block
7 Cover Life Tab -
See Removing the controller cover for more information.
8 Display Navigation Buttons - (Not available on all FX-PCG models)
9 LCD Display Area - (Not available on all FX-PCG models)
10 FC Bus - Terminal Block
5FX-PCG26 General Purpose Programmable Controller Installation Instructions
Table 1: FX-PCG2621 physical features
Callout Physical feature: description and references
11 SA Bus - Terminal Block. See SA bus terminal block
12 Sensor Port - (SA Bus) RJ-12 6-Pin Modular Jack.
13 Binary Inputs - can be defined as: Dry Contact Maintained Pulse Counter Mode (50 Hz
at 50% duty cycle)
14 Universal Inputs - can be defined as: Voltage Analog Input (0-10 VDC), Current
Analog Input (4-20 mA), Resistive Analog Inputs (0-600k ohm): 0-2k Potentiometer.
RTD: 1k Nickle, 1k Platinum, or A99B SI. NTC: 10k Type L 10k JCI Type II, or 2.252k Type
II Dry Contact Binary Input
15 LED Status Indicators - See Table 9 for more information.
16 FC Bus Port - RJ-12 6-Pin MModular Jack. See FC Bus port for more information.
17 Cover Lift Tab
Wiring
CAUTION
Risk of Electric Shock.
Disconnect the power supply before making electrical connections to avoid electric shock.
Risque de décharge électrique.
Débrancher l'alimentation avant de réaliser tout raccordement électrique afin d'éviter tout risque de
décharge électrique.
CAUTION
Risk of Property Damage:
Do not apply power to the system before checking all wiring connections. Short circuited or improperly
connected wires may result in permanent damage to the equipment.
Mise En Garde: Risque de dégâts matériels:
Ne pas mettre le système sous tension avant d'avoir vérifié tous les raccords de câblage. Des fils
formant un court-circuit ou connectés de façon incorrecte risquent d'endommager irrémédiablement
l'équipement.
Important: Do not exceed the controller electrical ratings. Exceeding controller electrical
ratings can result in permanent damage to the controller and void any warranty.
Important: Use copper conductors only. Make all wiring in accordance with local, national,
and regional regulations.
Important: Electrostatic discharge can damage controller components. Use proper
electrostatic discharge precautions during installation, setup, and servicing to avoid damaging
the controller.
FX-PCG26 General Purpose Programmable Controller Installation Instructions6
For detailed information on configuring and wiring an MS/TP Bus, FC bus, and SA bus, refer to
the FX-PC Series Controllers MS/TP Communications Bus Technical Bulletin (LIT-12011670) or MS/TP
Communications Bus for BCPro System Technical Bulletin (LIT-12011908).
Terminal blocks and bus ports
See Figure 3 for terminal block and bus port locations on the controller. Observe the following
guidelines when wiring a controller.
Input and Output terminal blocks
All of the fixed input terminal blocks are mounted on the bottom of the controller and the output
terminal blocks are mounted on the top of the controller. See Table 4 for more information about I/
O terminal functions, requirements, and ratings.
FC bus terminal block
The FC Bus terminal block is a blue, removable, 4-terminal plug that fits into a board-mounted jack.
Wire the removable FC bus terminal block plugs on the controller, and other controllers in a daisychain configuration using 3-wire twisted, shielded cable as shown below. See Table 6 for more
information.
Figure 4: FC bus terminal block wiring
7FX-PCG26 General Purpose Programmable Controller Installation Instructions
Note: The FC bus Shield (SHLD) terminal is isolated and can be used to connect (daisy chain)
the shields for FC bus wiring.
SA bus terminal block
The SA Bus terminal block is a brown, removable, 4-terminal plug that fits into a board-mounted
jack.
Wire the removable SA Bus terminal block plugs on the controller and other SA Bus devices in a
daisy-chain configuration using 4-wire twisted, shielded cable as shown in the following figure. See
Table 6 for more information.
Figure 5: SA bus terminal block wiring
Note: The SA PWR terminal supplies 15 VDC. The SA PWR terminal can be used to connect
(daisy chain) the 15 VDC power leads on the SA bus.
FC Bus port
The FC bus port on the front of the controller is an RJ-12, 6-position modular jack that provides a
connection for the FX-BTCVT Bluetooth® Commissioning Converter, or FX-ZFR1811 Wireless Field
Bus Router.
The FC bus port is connected internally to the FC bus terminal block. See Table 6 for more
information. The FC bus Port pin assignment is shown in Figure 6.
FX-PCG26 General Purpose Programmable Controller Installation Instructions8
Figure 6: Pin number assignments for sensor, and SA bus ports on controllers
Sensor port
The Sensor (SA Bus) port on the bottom of the controller is an RJ-12, 6-position modular jack
that provides a connection for the Bluetooth Commissioning Converter, the VAV Balancing Tool,
specified network sensors, or other SA Bus devices with RJ-12 plugs.
When the FEC is configured for N2 communication, the SA Bus port must be used to download and
commission the controller. An FX-DIS Local Controller Display also can be connected to the SA Bus
port (but only on FX-PCG models without integral display and push buttons).
The Sensor port is connected internally to the SA bus terminal block. See Table 6 for more
information. The Sensor Port pin assignment is shown in Figure 6.
Supply power terminal block
The 24 VAC supply power terminal block is a gray, removable, 3-terminal plug that fits into a boardmounted jack on the top right of the controller.
Wire the 24 VAC supply power wires from the transformer to the HOT and COM terminals on the
terminal plug as shown below. The middle terminal on the supply power terminal block is not used.
See Table 6 for more information about the Supply Terminal Block.
9FX-PCG26 General Purpose Programmable Controller Installation Instructions
Figure 7: 24 VAC supply power terminal block wiring
Note: The supply power wire colors may be different on transformers from other
manufacturers. Refer to the transformer manufacturer’s instructions and the project
installation drawings for wiring details.
Important: Connect 24 VAC supply power to the controller and all other network devices so
that transformer phasing is uniform across the network devices. Powering network devices
with uniform 24 VAC supply power phasing reduces noise, interference, and ground loop
problems. The FX-PCG does not require an earth ground connection.
Wireless network applications
The controller can also be installed in a wireless application using an FX-ZFR Wireless Field Bus
Router.
To configure a controller for use with the FX-ZFR Series Wireless Field Bus system:
1. Wire the input/output terminals and SA bus.
Note: In wireless network applications, do not connect any wires to the FC bus terminal
block. (Connect the SA/FC terminal block on a PCX to an SA bus only.)
2. Connect the FX-ZFR181x or FX-ZFR182x Wireless Field Bus Router to the FC bus port (RJ-12
FX-PCG26 General Purpose Programmable Controller Installation Instructions10
modular jack) on the front of the controller.
3. Ensure that the controller's device address DIP switches are set to the correct device address.
See Setting the device addresses.
4. Set DIP switch 128 to ON, which enables wireless operation on the FX-PCG.
For more information on the ZFR Pro Wireless Field Bus system, refer to the WNC1800/ZFR182x
Pro Series Wireless Field Bus System Product Bulletin (LIT-12012320).
For more information on the ZFR 1800 Wireless Field Bus system, refer to the ZFR1800 Series
Wireless Field Bus System Product Bulletin (LIT-12011336).
Termination details
A set of Johnson Controls termination diagrams provides details for wiring inputs and outputs to
the controllers. See the figures in this section for the applicable termination diagrams.
Table 2: Termination details
Type of field
device
Temperature
Sensor
Voltage Input External Source
Voltage Input Internal Source
Type of
Input/
Output
UI
UI
UI
Termination diagrams
Voltage Input
(Self-Powered)
UI
11FX-PCG26 General Purpose Programmable Controller Installation Instructions
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