Detcon X40-32-N7 - Manual (Page 8)

Model X40
Model X40 Instruction Manual Rev. 3.3 Page 2 of 64
1.2 LCD Main Display Function
The main display is an 1
1
/
4
" x 6" backlit LCD that is four lines by forty characters and displays up to eight
configured channels at one time. The four internal magnetic switches are located above the backlit LCD
display and offer basic navigation for a complete configuration of the controller (Section 5.1).
Real time sensor status includes:
 channel number
 gas concentration,
 device tag (gas type)
 alarm/fault status.
Each channel displays the current status of three alarm levels and a fault condition on the front panel LED
indicators.
1.3 Modbus™ Communication
The controller uses the RS-485 Modbus™ RTU protocol to communicate with RS-485 serial sensors and
I/O modules. A secondary Modbus™ port is addressable by a PLC, PC/HMI, DCS or other Modbus™
RTU master-polling devices.
Primary Modbus™ Interface (COMM1 Master)
Uses two-wire half duplex RS-485, 9600 baud, 8 data bits, 1 stop bit, no parity. Communicates directly
with Modbus™ capable sensors and Detconꞌs independently addressable I/O modules that operate on 11.5-
30VDC.
Secondary Modbus™ Interface (COMM2 Slave)
The Modbus
™ slave interface communicates with the remote display or an additional controller.
1.4 Secure Digital Card (SD Card)
The X40 controller allows data logging when an SD memory card is installed. The card must be installed
on the back of the PCA (printed circuit assembly) before the controller is powered up. The controller will
automatically format the card (Section 4.0) and create the necessary files for data logging.
NOTE
Data logging does not occur during the first 10 minutes after power-up of the unit. This
delay allows the sensors time to stabilize, so that inaccurate or faulty readings will not be
logged during this stabilization period.
1.5 I/O Modules and Connections
A maximum of 32 sensor channels are configurable for the X40 models and are customizable using
Detconꞌs I/O modules. Accommodation for the I/O modules relies on the type of enclosure utilized.
Seamless system expansion is accomplished through DIN rail mounted and stackable modules.
The
modules communicate with the controller using Modbus™ technology and are available in four types;
 4-20mA inputs
 dry contact inputs
 4-20mA outputs
 relay outputs.