m
Model 10C
Single Sensor Control Module
Operator’s Installation and Instruction Manual
Covers all Model 10C Control Modules
The Woodlands, Texas 77387
Ph.281.367.4100 / Fax 281.298.2868
January 29, 2009 • Document #3256 • Revision 0.B
DETCON, Inc.
3200 Research Forest Dr.,
www.detcon.co
Model 10C
Blank Page
Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands Texas 77381
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 •
10C Control Module Instruction Manual ii
www.detcon.com • sales@detcon.com
Model 10C
Table of Contents
1.0 Description................................................................................................................................................ 1
1.1 Display Function .................................................................................................................................. 2
1.2 Alarm Functions................................................................................................................................... 2
1.2.1 Latching or Non-latching Relays.................................................................................................. 2
1.2.2 Energized or De-energized Relay Coils ....................................................................................... 2
1.2.3 Ascending or Descending............................................................................................................. 3
1.2.4 Silenceable or Non-silenceable (Alarm Acknowledge) ................................................................ 3
1.2.5 Alarm Reset .................................................................................................................................. 3
1.3 Fault Circuit Functions......................................................................................................................... 4
1.4 RS-485 Modbus™................................................................................................................................ 5
1.5 Controller Models................................................................................................................................. 5
2.0 Operator Interface................................................................................................................................... 7
2.1 Normal Operation................................................................................................................................. 7
2.2 Program Mode...................................................................................................................................... 8
3.0 Normal Operation.................................................................................................................................. 10
3.1 Display Gas Concentration and Alarm Condition.............................................................................. 10
3.2 Displaying Gas Type and Units.......................................................................................................... 11
3.3 Program Status ................................................................................................................................... 11
4.0 Program Mode ....................................................................................................................................... 12
4.1 Set Gas Type ...................................................................................................................................... 12
4.2 Range Set............................................................................................................................................ 14
4.3 Set Units ............................................................................................................................................. 15
4.4 Alarm 1, 2, and Fault Set.................................................................................................................... 15
4.4.1 Set-Point ..................................................................................................................................... 15
4.4.2 Direction: Ascending / Descending............................................................................................ 16
4.4.3 Latching / Non-latching.............................................................................................................. 16
4.4.4 Energized / Non-energized ......................................................................................................... 16
4.4.5 Acknowledge: Silenceable / Non-silenceable............................................................................. 16
4.5 Modbus™ Set..................................................................................................................................... 17
4.6 Sensor-Cal Mode................................................................................................................................ 17
4.7 Test ..................................................................................................................................................... 18
5.0 Special Configuration (Technician Access) ......................................................................................... 19
5.1 Trim Input........................................................................................................................................... 19
5.2 Trim Output........................................................................................................................................ 20
5.3 Default Settings .................................................................................................................................. 21
6.0 Calibration.............................................................................................................................................. 22
7.0 Specifications.......................................................................................................................................... 23
8.0 Warranty and Service Policy................................................................................................................ 24
Table of Figures
Figure 1 System Application Diagrams............................................................................................................ iv
Figure 2 Front Panel of 10C Controller............................................................................................................ 1
Figure 3 Board Assembly Picture of 10C Controller ......................................................................................9
10C Control Module Instruction Manual iii
Model 10C
Master
Controller
Modbus
HOST
Modbus
HOST
4-20mA Current Output
M
O
C
S
U
B
D
O
M
5
8
4
S
R
10C
Controller
M
Facilities
Module
10C
Controller
4-20mA Current Input
4-20mA Current Input
Sensor
Fault
Alarm1
Alarm2
ZONE 1 OUTPUTS
Sensor
OUTPUT DEVI CES
10C
Controller
4-20mA Current Input
Sensor
10C
Controller
10C
Controller
10C
Controller
Relay
Outputs
4-20mA Current Input
4-20mA Current Input
4-20mA Current Input
Sensor
Sensor
Sensor
ZONE 2 OUTPUTS
Figure 1 System Application Diagrams
10C Control Module Instruction Manual iv
Model 10C
1.0 Description
The Detcon Model 10C single sensor control module (10C Controller) is designed to supervise and display gas
concentration and the status of a remote gas sensor assembly. Mod 10C Controllers may be configured for a
variety of toxic and combustible gases. The 10C Controller is designed to operate on a nominal input voltage
range of 12 VDC to 24VDC and is compatible with a complete line of Detcon enclosures. The available
enclosures include designs for stand-alone, rack, or panel mount indoor non-hazardous areas (NEMA 1 and
12), weatherproof indoor/outdoor locations in non-hazardous areas (NEMA 4 and 4X), and for indoor/outdoor
location in areas classified as Class 1, Division 1, Groups B, C, and D hazardous (NEMA 7).
10C controllers accept 4-20mA current-loop analog input, and feature a four-character display, RS-485
Modbus™ serial communications, 4-20mA analog signal output, and three alarm relays (Alarm 1, Alarm 2,
and Fault). Alarm status is displayed via light emitting diodes (LEDs) located on the front panel. Multiple
10C Controllers, each configured individually and installed in a 10-Series Detcon Enclosure, provide the
monitoring of a variety of gases from several field sensors in one system.
The , exemplifies how 10C Controllers can be utilized and connected
Figure 1 System Application Diagrams
in an overall Model 10C System.
The overall 10C system design includes Facilities Modules and Relay Modules to be applied with a collection
of 10C Controllers. These additional modules are optional and are the same form-factor as the 10C Controller.
The Facilities Module communicates with 10C Controllers to gather data to associate the controllers in
assigned zones, to optionally log data, to report multiple controllers as one Modbus™ ID, and to logically
process and output conditions to the Relay Modules. The scope of this document is restricted to the 10C
controller and does not include any further description of the Facilities and Relay modules.
Pushbuttons located on the Front Panel provide access to retrieve and set information within the controller 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 10C Controller’s configuration.
RESET ALARM. The “UP”
pushbutton doubles as the Reset
Alarm function.
SILENCE ALARM. The
“DOWN” pushbutton doubles
as the Silence Alarm function.
Figure 2 Front Panel (faceplate) of 10C Controller
10C Control Module Instruction Manual Rev. 0.B Page 1 of 25
Four character display shows
numeric values and text. Scrolls text
for improved interactive function.
Alarm 1 and Alarm 2 LED
indicators.
Fault Alarm LED indicator.
Four pushbuttons provided for
interactive user interface to configure
and view values and settings in
Controller. Keys are: ESCAPE,
ENTER,
×UP and ØDOWN.
Model 10C
1.1 Display Function
The main purpose of the 10C Controller’s 4-character display is to show the gas concentration reading at all
times. The reading is given in numeric form and with the desired units, as converted from the current input
signal of the attached gas sensor. Upon operation of the pushbuttons, the display also allows viewing gas type
and units very simply, and with further manipulation allows viewing of any configurable setting.
1.2 Alarm Functions
The alarm configuration, programmed into the controller, determines how the 10C Controller responds to the
4-20mA current-loop analog input. In response to the analog input relative to alarm configuration, the
Controller outputs to its relays and panel LEDs. Alarm configurations for the alarm output relays and LEDs
can be programmed as latching or non-latching, ascending or descending, energized or de-energized, and
silenceable or non-silenceable operation. Any combination of these settings can be programmed to provide
setups for almost any contingency. Some planning may be needed to determine the best configuration for the
application.
1.2.1 Latching or Non-latching Relays
All alarms, Alarm 1, Alarm 2, and Fault, can be programmed as Latching or Non-latching. If an alarm is
programmed to Latch, its corresponding relay and LED Indicator, once activated, will stay activated until
reset, even if the analog input “clears”.
NOTE: The term “Clear” refers to when the alarm condition of the sensor signal returns to
normal, which means that the input current changes to the non-alarm side of the Set-Point
threshold.
If an alarm is programmed as Non-latching, the alarm will not remain activated if the analog input clears.
There is a reset pushbutton on the 10C front panel and there is also a signal input to the 10C controller via the
backplane where an external switch can be connected. When the “Reset” pushbutton on the front panel or the
external switch is momentarily activated, the 10C accepts the signal as an alarm reset function. If resettable
alarms are latched, and in response to the front panel reset switch, the 10C front panel display will scroll the
text: “Reset Alarms?” In response to this query, the “ENT” pushbutton should be pressed to acknowledge the
reset. In response to an front panel reset button acknowledgement , the front panel display scrolls the text:
“Reset DONE”.
The external reset does not have an acknowledge feature and when the 10C Controller senses that the external
reset signal is momentarily activated, the 10C scrolls a text message on its front panel display: “Ext Alm Rst”.
1.2.2 Energized or De-energized Relay Coils
All alarm relays (Alarm 1, Alarm 2, and Fault) can be programmed as normally Energized or normally Deenergized. The standard setting for alarms is De-energized, however, a relay can be programmed as Energized
to provide application specific features. For De-energized relays, the coil will energize in an alarm state. For
Energized relays, the coil is normally Energized and will de-energize in an alarm state. It should be noted that
with a normally Energized relay the N.O. (Normally Open) contact and the COM (Common) contact are
CLOSED, and the N.C. (Normally Closed) contact and the COM contact are OPEN, while in the non-alarm
state.
10C Control Module Instruction Manual Rev.0.B Page 2 of 25
Model 10C
A typical application of an Energized relay could be the use of the Fault Relay in a Fail-Safe Fault Circuit. The
loss of functionality of the Controller would cause the coil to De-Energize, thus creating a Fault output to the
receiving equipment, for instance: if power is lost to the 10C Controller, or if the 10C module is unplugged
from the live chassis.
1.2.3 Ascending or Descending
Alarm 1, and Alarm 2 can be programmed for whether the alarm condition is triggered by an increasing
concentration (Ascending) or a decreasing concentration (Descending) through a set-point. The descending
feature, although mainly used for oxygen deficiency, can be useful for setting the trigger of alarms when there
is lack of gas concentration. When set for ascending, the associated alarms will trigger when the gas
concentration goes above the preset set-point. When set for descending, the associated alarms will trigger
when the gas concentration falls below the preset set-point.
1.2.4 Silenceable or Non-silenceable (Alarm Acknowledge)
The terminology “to acknowledge alarms” is synonymous with the terminology “to silence an alarm”. All
Alarms (Alarm 1, Alarm 2, and Fault) can be programmed as Silenceable or Non-silenceable. When an alarm
is programmed as Silenceable, the setting allows the alarm(s) to be silenced even during an alarm state. To
silence an alarm the 10C controller’s alarm must be programmed as Silenceable. When an alarm occurs, the
Silenceable alarm can be silenced by pressing the “SLNC” pushbutton, followed by acknowledging the
“Silence Alarms?” scrolling display by pressing the “ENT” pushbutton. An instance where this feature might
be used is a Strobe device connected to Alarm 1 and a Horn device connected to Alarm 2. In the event of an
alarm, where both the Strobe and Horn were activated, the Horn could be silenced while the Strobe would
remain activated. The silenced state is reset when and if the alarm condition clears and then exceeds alarm setpoint again. The Horn would be reactivated upon the return of the alarm condition.
The “Remote Reset” signal that resets latched alarms also functions as a signal to silence active Silenceable
Alarms.
NOTE: There is a minimum alarm time before acknowledge. When a silenceable alarm
triggers, a minimum-time timer starts. Whenever a silenceable alarm is attempted to be
silenced, the alarm will not silence unless/until the minimum-time timer has timed out. This
guarantees that the alarm has a minimum activity time.
1.2.5 Alarm Reset
An alarm “RESET” pushbutton key-switch is located on the front panel of the 10C Controller. This switch is
used to reset alarms that have been programmed as latching. Once alarm conditions clear, alarms that have
been set as latching can be reset by use of this switch. If cleared latched alarms are pending, pressing the
“RESET” pushbutton will cause the display to scroll the text: “Reset Alarms?” Pressing the “ENT”
pushbutton will reset the alarms which is apparent with the displayed text: “Reset DONE”. The “Remote
Reset” signal, activated from an optional external switch, can be momentarily operated to reset the latched
relays.
The “Remote Reset” signal needs to be operated only once and without an acknowledge sequence, to reset all
pending latched alarms. The text “Ext Alm Rst” scrolls across the 10C Controller front panel display when the
“Remote Reset” signal is sensed.
10C Control Module Instruction Manual Rev. 0.B Page 3 of 25
Model 10C
1.3 Fault Circuit Functions
How the 10C Controller responds to a fault condition is determined by the configuration programmed into the
controller. Faults can be programmed as latching or non-latching, energized or de-energized, and silenceable
or non-silenceable operation. Any combination of these settings, and the set-point threshold at which a fault
will trigger, can be programmed to provide setups for almost any contingency. Some system level planning
should be exercised to determine the best configuration for the application.
10C Controllers can be set up in a Fail-Safe Fault supervisory circuit. A Fail-Safe Fault can be created by
setting the Fault Relay as Energized, and connecting the fault circuits of several 10C Controllers in electrical
series. If a fault occurs anywhere in the series circuit, the de-energized fault relay will ‘break’ the circuit,
causing a system fault. The logical “OR” of all faults in the series circuit is simply constructed with such a
method. Mainly, with this set-up, loss of power to any unit will break the circuit because of the normallyenergized coils, thus creating a “Fault Condition” due to the loss of power.
The 10C Controller is designed to detect a sensor as being “In Calibration Mode” when the 4-20mA input is
nominally 2mA. The Display will show “CAL” to signify this sensor Calibration Mode. When the 10C
Controller 4-20mA falls below 2mA, the display will change to “SENS” to signify that there is a sensor related
problem. The Fault Set-Point can be set to any point below 4mA (in steps of .05mA) so that the input of the
sensor can trigger a fault at any point below 4mA.
For 3-wire sensors, the Set-Point can be adjusted to 1.8mA so that when the sensor is in Calibration, a Fault is
not generated. If the input current falls below 1.8mA, a fault will be generated. Since most sensors reduce
their output current for internally detected faults, this set-point is a good setting.
For 2-wire sensors, the sensor uses the loop current for power and so the set-point ordinarily must be set
higher. The fault Set-Point for 2-wire sensors is suggested to be 3.5mA.
10C Control Module Instruction Manual Rev.0.B Page 4 of 25
Model 10C
1.4 RS-485 Modbus™
The 10C Controllers feature Modbus™ compatible communications protocol and are addressable via the
programming menu for multi-point communications. Communication is two wire, half-duplex, with the
Model 10C controller set up as a slave device. A master controller can address a maximum of 255 different
10C Controllers. The actual limit of how many 10C Controllers can be connected to one RS485 Multi-drop
line depends upon desired maximum response time, noisy conditions, cable quality, and length. If a multipoint system is utilized, each 10C Controller must be set with a unique Modbus™ address. Address settings
are given in hexadecimal, such as: 01, 02, 03, 04, 05, 06, 07, 08, 09, 0A, 0B, 0C, 0D, 0E, 0F, 10, 11, etc. (See
Section 4.5 to set the Modbus™ address.)
The following register list describes the parameters available from 10C controller:
Register # High Byte Low Byte
40000 Range
40001 Reading
40002 Alarm 1 Set Point
40003 Alarm 2 Set Point
40004 Not Used
40005 Status Bits
40005 Status Bits High Byte:
Bit 15 – Reserved
Bit 14 – Reserved
Bit 13 – Reserved
Bit 12 – Test mode status
Bit 11 – Reserved
Bit 10 – Reserved
Bit 9 – Reserved
Bit 8 – Reserved
40005 Status Bits Low Byte:
Bit 7 – Alarm 2 / 0 – Ascending, 1 – Descending
Bit 6 – Alarm 2 / 0 – Non-latching, 1 – Latching
Bit 5 – Alarm 2 alarm status / 0 – no alarm, 1 – alarm
Bit 4 – Alarm 1 / 0 – Ascending, 1 – Descending
Bit 3 – Alarm 1 / 0 – Non-latching, 1 – Latching
Bit 2 – Alarm 1 alarm status / 0 – no alarm, 1 – alarm
Bit 1 – Fault / 0 – Non-latching, 1 – Latching
Bit 0 – Fault status / 0 – no fault, 1 - fault
1.5 Controller Models
Table 1 provides a list of the available 10C Controller Models, the target gas, the standard Range and Units for
that gas, and the gas formula. Most 10C Controllers can be programmed for a Range other than the standard
Range if needed. (For more information on setting Range, see Section 4.2 Range Set.)
The label on the Model 10 faceplate follows a standard color scheme for identifying the gas type: Yellow =
Solid State H2S, Orange = Combustible Gas, Green = Oxygen and Blue = Electrochemical Toxic (various).
The gas identifier label on the face plate also shows the gas formula and Units: ppm, ppb, or %.
10C Control Module Instruction Manual Rev. 0.B Page 5 of 25
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