Main Back Board (S722)

The Main Back Board of the XT+ Extinguishant Control Panel provides slots for required and optional panel modules, as well as for field wiring and power supply terminations.

Minimum functions of the XT+ Extinguishant Control Panel are provided when Slot A of the Main Back Board contains System A Panel Module, Slot B contains System B Panel Module, and Slots C, D, E, or F contain a Dual Loop Panel Module. Two addressable loops are provided by the Dual Loop Panel Module in this configuration. The following figure illustrates the Main Back Board and the Power Supply of the cabinet box:

The Main Back Board contains connector slots A through F. Operation of the XT+ Extinguishant Control Panel requires that one Dual Loop Panel Module is connected in slots C, D, E, or F to meet minimum operating requirements.

The Dual Loop Panel Module can be connected in slots C, D, E, or F of the Main Back Board. Slot C of the Main Back Board is the factory location for the Dual Loop Panel Module connection.

NAC and AUX 24V Terminals

NAC terminals 1 to 4 provide 24 VDC @ 2.5 A. In the default state, these circuits can be connected as four Class B supervised outputs. However, they can be configured as two Class A or two Class B and one Class A output. Power limited circuits should be routed separately from non-power limited circuits. The following figure illustrates the NAC and AUX 24V terminals of the Main Back Board:

Field Terminals

Designation

 Supervision Power Limited

( + ) and ( - )

NAC 1

 using EOL diode Yes

( + ) and ( - )

 NAC 2 using EOL diode Yes

( + ) and ( - )

 NAC 3 using EOL diode Yes

( + ) and ( - )

 NAC 4 using EOL diode Yes

OUT ( + ) and ( - )
RTN ( + ) and ( - )

AUX 24V (1)

 Supervision by connecting the end of the cable back to the RTN Yes

OUT ( + ) and ( - )
RTN ( + ) and ( - )

AUX 24V (2)

 Supervision by connecting the end of the cable back to the RTN Yes

Terminals

The default designation is as shown below, however all 5 relays are user-configurable.

Field Terminals

Default Operation

 Default Setting

NO, C, and NC

TROUBLE RELAY

 Trouble

NO, C, and NC

FIRE RELAY

 Fire

NO, C, and NC

SUPERV RELAY

 Supervisory

NO, C, and NC

PROG 1 RELAY

 Transparent

NO, C, and NC

PROG 2 RELAY

 Transparent

Panel Module Slots

The following figure illustrates the Panel Module Slots of the Main Back Board:

Field Terminal Assignments

Panel module slot positions on the Main Back Board correspond to specific field terminal locations on the Main Back Board.

Slot

Field Terminal Location

C

Addressable Loops 1 and 2

D

Addressable Loops 3 and 4

E

 Addressable Loops 5 and 6 or 8 Channel Relay.

F

 Addressable Loops 7 and 8 or 8 Channel Relay, or Media Gateway

Slots A and B do not contain corresponding lettering on field terminals of the Main Back Board. These slots are dedicated system boards that operate primary functions. System A Panel Module must connect to slot position A on the Main Back Board and System B Panel Module must connect to slot position B on the Main Back Board.

Panel Module Slots

Board Slot C

The following figure illustrates the Board Slot C terminals of loops 1 and 2:

Field Terminals Board Location Function
1-4 and 5-8 Slot C Loop 1 and Loop 2

Board Slot D

The following figure illustrates the Board Slot D terminals of loops 3 and 4:

Field Terminals Board Location Function
1-4 and 5-8 Slot D Loop 3 and Loop 4

Board Slot E

The following figure illustrates the Board Slot E terminals of loops 5 and 6:

Field Terminals Board Location Function
1-4 , 5-8, and 9-16 Slot E Loop 5 and Loop 6

Board Slot F

The following figure illustrates the Board Slot F terminals of Loops 7 and 8:

If you have, or plan to obtain, a Media Gateway Panel Module, it must be installed into Board Slot F.

Field Terminals Board Location Function
1-4 , 5-8, and 9-16 Slot F Loop 7 and Loop 8

Extension Board Power Terminals

This figure illustrates Extension Board Power Terminals of the Main Back Board. These terminals are non-power limited.

Field Terminals Description
( - ) Two terminals for providing 0 VDC return-power ( - ).
( + ) Two terminals for providing 24 VDC power ( + ).

These terminals are used for factory wiring purposes only.

Network, RS-485 I/O, Fire Routing Output 1, and Prog Input

The following figure illustrates Network, RS-485 I/O, Fire Routing Output 1, and Prog Input of the Main Back Board:

Field Terminals Description
NETWORK Provides Class X connections for intra-panel and annunciator networking.
RS-485 I/O Provides ancillary RS-485 connections for external modules.
FIRE ROUTING OUTPUT 1 Not used. Reserved for future use.
PROG
INPUTS		 Provides three programmable inputs that operate on active low thresholds.

Power Supply Terminals

Power Supply Terminals of the Main Back Board are used for factory wiring purposes only.

 

Field Terminals

Description

 Power Limited

Ground terminal connection

 N/A

TRBL

Power trouble input. Active when connected to negative terminal ( - ).

Yes

( - )

Negative terminal connection from the 24V DC power supply

 Non-power limited

( + )

Positive terminal connection from the 24V DC power supply

 Non-power limited

0V Terminals

This figure illustrates 0V terminals of the Main Back Board. These terminals provide general purpose 0V and are non-power limited.

Power Supply Trouble Signaling Connector

The following figure illustrates the Power Supply Trouble Signaling Connector of the Main Back Board. This terminal provides power and trouble signaling from the power supply.

Supervised Input and Output Terminals

Fire and Trouble routing outputs provide supervised, 24V DC voltage with reversing outputs. Refer to Main Back Board Specifications for detailed information about these terminals.