7 rs-485 m – Detcon FL-10 User Manual

Page 6

2.7 RS-485 M

ODBUS

™ F

EATURES AND

PECIFICATIONS

Model FL10 control modules feature Modbus™ compatible communications protocol and are addressable via the pro-

gramming menu for multi-point communications. Communication is two wire, half duplex, with the Model FL10 con-

trol module set up as a slave device. A master controller up to 4000 feet away can theoretically poll up to 256 different

Model FL10 control module cards. This number may not be realistic in harsh environments where noise and/or wiring

conditions would make it impractical to place so many devices on the same pair of wires. If a multi-point system is

being utilized, each control module should be set for a different address. Typical address settings are: 01, 02, 03, 04, 05,

06, 07, 08, 09, 0A, 0B, 0C, 0D, 0E, 0F, 10, 11, etc.

Model FL10 control module ID numbers are set via the SW3 dip switch bank as described in 2.4.3.

The following register list describes the parameters available from the Model FL10 control module:

40000

Not Used

40001

mA Input Reading 0-2000 (0 to 20.00 mA)

40002

Not Used

40003

Not Used

40004

Not Used

2.8 F

AULT

IRCUIT

UNCTIONS

Model FL10 control modules feature fail safe supervisory circuits designed to assure maximum reliability in system per-

formance. A fault condition will cause the fault LED to illuminate and the fault relay to actuate. The exception to this

is if the fault relay is jumper-programmed as normally energized, a loss of external 24 VDC power or the internal 5

VDC supply will cause the relay to de-energize but the LED will not illuminate. Below is a list of conditions that will

cause a fault alarm:

1. Loss of 24 VDC power to the Model FL10 control module (only if relay is programmed as normally energized).

2. Open power loop from the control module to the f lame sensor.

3. Open signal loop from the control module to the f lame sensor.

4. Loss of the internal 5 VDC supply (only if relay is programmed as normally energized).

5. Signal level drift below 2.4 mA from the f lame sensor.

Model FL10 Single Channel Flame Detection Control Module PG.6

MSB

LSB

Alarm 1 status

Alarm 2 status

Fault status

Fault energized

Fault latching

Alarm 2 ascending

Alarm 2 energized

Alarm 2 latching

Alarm 1 ascending

Alarm 1 energized

Alarm 1 latching

Not used

Test mode status