Detcon 10C Facilities - Manual (Page 6)

Model 10C
10C Control Module Instruction Manual Rev.0.0 Page 2 of 14
1.0 Description
Physically, the Detcon Model 10 Facilities Module (FM) is a Model 10C board assembly with some slight
variation in board component population
1 and with different firmware, compared to the Mod 10C Single
Sensor Controller (SSC) board.
The Detcon Model 10 Facilities Module is designed to be used primarily for gathering data from multiple
Mod10 Single Sensor Control modules. With the data from a group of sensors being available in the Facilities
Module, the Modbus Master only needs to talk to the FM in order to get the data from the group of sensors.
Another important function of the FM is to provide a final output for alarms, to represent the alarms for the
whole group. These alarms are provided as output through the relays on the FM module.
The Figure 1 System Application Diagram exemplifies how the FM is used to connect to a multitude of SSC
modules. The FM communicates with the SSC modules through the Modbus RS485 signal bus that runs
through the mother board backplane. The FM is limited to polling 32 Modbus Slave devices and so a
maximum installation might appear as: the FM board seated in the first slot of one card rack with the rest of
the slots occupied by 15 SSC boards, and with the Modbus jumpered to a second card rack filled with 16 SSC
boards. The FM has a second RS485 port for the purpose of interfacing to the Modbus Master Host. Since
analog inputs and outputs are not needed and are not used on the FM, the analog signal terminations on the
backplane for the FM slot are utilized for RS485 to the Host. The backplane board marks the terminal
“SENSOR MA” for the RS485+ signal (or “A” signal) and marks the terminal “4-20 OUT +” for the RS485-
signal (or “B” signal), these being the two signal wires for RS485 to the Modbus Master Host for the system.
The Operator Interface, or “Human Machine Interface” (HMI) is provided on the FM Front Panel Bracket. A
pushbutton switch located on the Front Panel provides access to retrieve and set information within the
Facilities Module, and to provide the “Alarm Reset” and “Alarm Silence” functions. The pushbuttons allow
the user to navigate through an interactive menu to access programming of the FM’s configuration. The
pushbutton layout, the display, and the navigation methods are modeled after the Mod 10C SSC. Given
familiarity with the SSC, the FM user interface is one that should be quickly mastered. The pushbuttons are
labeled:
Upper left button: “RESET” and [up-arrow symbol]
Lower left button: “SLNC” and [down-arrow symbol]
Upper right button: “ESC”
Lower right button: “ENT”
The single LED annunciators on the Front Panel Bracket are labeled ALM2, ALM1 and FAULT.
1.1 Display Function
The 4-character display on the front panel is provided the user to monitor and modify the configuration
settings of the FM and to see the status of communications between the FM and SSC modules. While idle, this
display shows the Modbus Address or ID of the FM module. The user can quickly see if a prevailing Fault
alarm is due to communications faults with any one or more SSC modules through this display. The FM’s
display does not allow the user to see individual SSC data; for that, the user should go to the SSC module and
access such data from the individual module.
1.2 Alarm Functions
The alarm configuration for each SSC can be individually set through the front panel of the individual SSC
module. Instructions for settings of the Mod10C are in the Instruction Manual for the Mod10C.
1
Components F1 and F4 are removed from the Mod10C assembly to make an FM assembly.