RC Systems ST-72 User manual

ST-72 User's Manual
Document: UM-1007 Revision Level A
0
INSTRUCTION MANUAL
R.C. SYSTEMS CO. INC.
MODEL ST-72 16,32,48 or 64 CHANNEL CONTROLLER
(Firmware 2.0 & later)
PHONE: (409)986-9800 FAX: (409) 986-9880
8621 HWY 6 HITCHCOCK, TX 77563
Website: http://www.rcsystemsco.com
Warning: Read & understand contents of this manual prior to
operation. Failure to do so could result in serious injury or death.

ST-72 User's Manual
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SECTION 1 GENERAL DESCRIPTION.............................................................1
1.1 IMPORTANT SAFETY ISSUES.........................................................................1
1.2 GENERAL DESCRIPTION.................................................................................2
1.3 DATA DISPLAY SCREENS...............................................................................3
1.3.1 MAIN DATA SCREEN 3
1.3.2 24 HOUR TREND SCREEN 5
1.3.3 BAR GRAPHS SCREEN 6
1.3.4 COMBINATION SCREEN 7
1.3.5 ZONE SCREEN 8
1.4 SPECIFICATIONS .............................................................................................9
1.4.1 DC POWER SUPPLY REQUIREMENTS 9
1.4.1.1 600 WATT AC –24VDC POWER SUPPLY 9
1.4.1.2 150 WATT AC –24VDC POWER SUPPLY 9
1.4.1.3 RELAYS 10
1.4.2 AMBIENT TEMPERATURE RANGE 10
1.4.3 HUMIDITY RANGE 10
1.4.4 ALTITUDE 10
1.4.5 HOUSINGS 10
1.4.6 NON-INTRUSIVE MAGNETIC KEYPAD 10
1.4.7 APPROVALS 11
SECTION 2 BASIC OPERATION ....................................................................12
2.1MAIN MENU CONFIGURATION......................................................................12
2.2 CHANGING MENU VARIABLES USING THE KEYPAD.................................20
2.3 ALARM OUTPUTS ..........................................................................................20
2.3.1 STANDARD RELAY 1, 2, AND 3 22
2.3.1.1 A1 A2 & A3 VOTES REQUIRED 22
2.3.1.2 ACKNOWLEDGE 22
2.3.1.3 FAILSAFE 23
2.3.1.4 ZONE 1-8 23
2.3.1.5 OVERRIDE CHANNELS 1-8 23
2.3.2 HORN/PIEZO 23
2.3.2.1 A1 A2 & A3 24
2.3.2.2 ACKNOWLEDGE 24
2.3.2.3 FAILSAFE 24
2.3.2.4 PIEZO ALARM 24
2.3.3 DISCRETE RELAY 24
2.3.4 PROGRAMMABLE RELAY 25
2.4 CHANNEL CONFIGURATION ENTRY MENU.................................................25
2.4.1 CHANNEL CONFIGURATION MENUS 26
2.4.2 ALARM 1 / ALARM 2 / ALARM 3 MENU 27
2.4.2.1 SETPOINT 27
2.4.2.2 LATCHING 27
2.4.2.3 TRIP ON 27
2.4.2.4 ON/OFF DELAYS 27

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2.4.2.5 HORN ON 28
2.4.2.6 COLOR 28
2.4.2.7 ENABLED 28
2.4.3 FAULT ALARM MENU 28
2.4.4 DATA FROM MENU TO SET INPUT SOURCE 28
2.4.4.1 SOURCE 29
2.4.4.2 MIN RAW & MAX RAW 29
2.4.4.3 FILTER SAMPLE COUNT 30
2.4.4.4 LOCAL CAL 30
2.4.4.5 MARKER MENU 31
2.4.4.6 REMOTE ID 32
2.4.4.7 ALIAS 33
2.4.4.8 INTERFACE 33
2.4.4.9 SLAVE BYTE ORDER 33
2.4.5 LINEARIZE 34
2.4.6 CONFIGURE MENU 34
2.4.6.1 INFO / MEASUREMENT NAME 35
2.4.6.2 ZERO / SPAN 35
2.4.6.3 DECIMAL POINTS 35
2.4.6.4 CHANNEL ON? 35
2.4.6.5 ZONE 35
2.4.6.6 DEADBAND 36
2.4.6.7 COPY TO CHANNEL 36
2.4.6.8 COPY TO GROUP 36
2.4.6.9 RESTORE CH. DEFAULTS 36
2.5 COMMUNICATION SETTINGS MENU............................................................36
2.5.1 COM 1-4 SETTINGS 38
2.5.1.1 FUNCTION 38
2.5.1.2 BAUDRATE 39
2.5.1.3 PARITY 39
2.5.1.4 TIMEOUT 39
2.5.1.5 POLL DELAY 39
2.5.1.6 SYMPATHY ENABLED 39
2.5.1.7 RADIO SETUP 40
2.5.1.8 SLAVE BYTE ORDER 40
2.5.1.9 WIRELESS TIMEOUT 40
2.5.2 MODBUS TCP SETTINGS 41
2.5.2.1 SLAVE BYTE ORDER 41
2.5.2.2 MASTER TIMEOUT 41
2.5.2.3 MASTER POLL DELAY 41
2.5.3 NETWORK SETTINGS 41
2.5.3.1 DHCP ENABLED 42
2.5.3.2 HOSTNAME 42
2.5.3.3 IP ADDRESS 42

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2.5.3.4 NETMASK 42
2.5.3.5 GATEWAY 42
2.5.4 TROUBLESHOOTING 42
2.5.4.1 VIEW COMM FAILURES 43
2.5.4.2 CLEAR FAILURE COUNTS 44
2.6 SECURITY MENU............................................................................................44
2.6.1 USER NAME 44
2.6.2 LOCK CODE 44
2.6.3 MODBUS LOCK CODE 44
2.7 SYSTEM MENU...............................................................................................45
2.7.1 VERSION 47
2.7.2 CONFIGURE 47
2.7.2.1 NAME 48
2.7.2.2 CONTRAST 48
2.7.2.3 DATE & TIME 48
2.7.2.4 ENABLE CHANNEL COUNT 48
2.7.2.5 DISPLAY ALARM 48
2.7.2.6 WARMUP & CAL PURGE TIME 48
2.7.2.7 ZONE SCREEN ENABLED 48
2.7.2.8 BLOCK NEGATIVE 48
2.7.2.9 RELAY REFRESH 48
2.7.3 ZONE NAMES 49
2.7.4 MIMIC MODE 49
2.7.5 SD CARD 50
2.7.5.1 CARD STATUS 50
2.7.5.2 LOGGER ENABLED 51
2.7.5.3 SAVE CONFIGURATION FILE 51
2.7.5.4 LOAD CONFIGURATION FILE 51
2.7.5.5 VIEW LOG FILE TREND 51
2.7.6 VIEW EVENT LOG 52
2.7.7 CLEAR EVENT LOG 53
2.7.8 VIEW SENSOR LIFE 53
SECTION 3 INPUT/OUTPUT BOARDS...........................................................54
3.1 MAIN I/O INTERFACE BOARD # 10-0331 ......................................................54
3.2 INPUT / OUTPUT OPTION BOARDS..............................................................55
3.2.1 OPTIONAL ANALOG INPUT BOARD # 10-0334 56
3.2.2 OPTIONAL DISCRETE RELAY BOARD # 10-0345 58
3.2.3 OPTIONAL *BRIDGE SENSOR INPUT BOARD #10-0347 59
3.2.4 BRIDGE SENSOR INPUT BOARD INITIAL SETUP 60
3.2.5 OPTIONAL 4-20mA ANALOG OUTPUT BOARD #10-0348 61
3.2.6 OPTIONAL PROGRAMMABLE RELAY BOARD # 10-0350 62
3.2.7 OPTIONAL 24VDC 600 WATT POWER SUPPLY 64
3.2.8 OPTIONAL 24VDC 150 WATT POWER SUPPLY #10-0172 65
SECTION 4 DIAGNOSTICS.............................................................................66

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4.1 STANDARD RELAYS......................................................................................66
4.2 DISCRETE RELAYS........................................................................................67
4.3 PROGRAMMABLE RELAYS...........................................................................67
4.4 ANALOG INPUTS............................................................................................68
4.4.1 VIEW INPUTS 68
4.4.2 CALIBRATE BOARD 68
4.5 ANALOG OUTPUTS........................................................................................69
4.6 PIEZO ..............................................................................................................69
4.7 LEDS ...............................................................................................................70
4.8 SERIAL PORTS...............................................................................................71
4.9 I/O BOARD CONFIGURATION........................................................................72
SECTION 5 MODBUS......................................................................................73
5.1 MODBUS TCP.................................................................................................73
5.2 MODBUS SLAVE WRITES..............................................................................73
5.3 MODBUS SLAVE REGISTER LOCATION......................................................73
5.3.1 COILS 74
5.3.2 DISCRETE INPUTS 74
5.3.3 INPUT REGISTERS 76
5.3.4 HOLDING REGISTERS 80
5.3.5 STANDARD RELAY 1 81
5.3.6 STANDARD RELAY 2 84
5.3.7 STANDARD RELAY 3 87
5.3.8 DISCRETE RELAYS 89
5.3.9 HORN/PIEZO 90
5.3.10 CHANNEL CONFIGURATION 90
5.3.11 PROGRAMMABLE RELAYS 94
SECTION 6 ENCLOSURE OPTIONS..............................................................98
6.1 ST-72PM PANEL / RACK MOUNT ENCLOSURE...........................................98
6.2 ST-72N4 NEMA 4X LARGE WALL MOUNT FIBERGLASS ENCLOSURE.....99
6.3 ST-72CP NEMA 4X COMPACT WALL MOUNT FIBERGLASS ENCLOSURE
100
6.4 ST-72XP NEMA 7 WALL MOUNT ALUMINUM ENCLOSURE......................102
6.5 ST-72 MAIN I/O & OPTION PCB FOOTPRINT DIMENSIONS AND
ENCLOSURE CAPACITIES.......................................................................................103
SECTION 7 WIRELESS OPTION ..................................................................105
7.1 RADIO SETUP MENU ...................................................................................106
7.1.1 HOP CHANNEL 107
7.1.2 SYSTEM ID 107
7.1.3 MODE 107
7.2 WIRELESS MONITOR MODE .......................................................................107
7.2.1 RADIO STATUS ALARMS - WIRELESS MONITOR MODE 108
7.2.1.1 COMMUNICATIONS ERROR 108
7.2.1.2 LOW BATTERY 109
7.2.1.3 CALIBRATIONS 109
7.3 WIRELESS MODBUS SLAVE MODE............................................................109
7.4 WIRELESS MODBUS MASTER MODE ........................................................109

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7.5 ANTENNA SELECTION ................................................................................110
7.5.1 DIPOLE AND COLLINEAR ANTENNAS 110
7.5.2 YAGI ANTENNAS 110
7.5.3 MOUNTING NEAR OTHER ANTENNAS 111
7.5.4 COAX CABLES 111
7.6 SURGE PROTECTION & GROUNDING........................................................112
7.6.1 ANTENNA GROUNDING 112
SECTION 8 WEBPAGE.................................................................................114
8.1 SYSTEM SCREEN.........................................................................................115
8.2 ZONE SCREEN .............................................................................................116
8.3 CHANNEL SCREEN......................................................................................117
8.4 EVENT LOG SCREEN...................................................................................118
8.5 CONFIGURE..................................................................................................119
8.5.1 ALARM OUTPUTS 119
8.5.2 CHANNEL CONFIGURATION 120
8.5.3 COPY CHANNELS 121
8.5.4 PROGRAMMABLE RELAYS 122
8.5.5 SYSTEM CONFIGURATION 123
8.5.6 CONFIGURATION UPLOAD/DOWNLOAD 124
SECTION 9 TROUBLESHOOTING ...............................................................125
9.1CHANNEL ERRORS......................................................................................125
9.1.1 COMM ERROR 125
9.1.2 CONFIG ERROR 125
9.1.3 I/O ERROR 125
9.2 RESET TO FACTORY DEFAULTS ...............................................................126
SECTION 10 NETWORK CONNECTION........................................................127
10.1 DIRECT CONNECTION WITH CROSSOVER CABLE OR HUB/SWITCH.....127
10.2 CONNECTING THE ST-72 TO AN EXISTING LAN.......................................128
10.3 CONNECTING THE ST-72 ON AN ISOLATED NETWORK..........................129
10.4 STATIC IP CONFIGURATION.......................................................................130
10.4.1 ST-72 STATIC IP CONFIGURATIION 130
10.4.2 WINDOWS XP STATIC IP CONFIGURATION 130
10.4.3 DYNAMIC IP CONFIGURATION 133
10.5 TESTING CONNECTIONS.............................................................................134

ST-72 User's Manual
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SECTION 1 GENERAL DESCRIPTION
1.1IMPORTANT SAFETY ISSUES
The following symbols are used in this manual to alert the user of important instrument
operating issues:
WARNINGS:
Shock Hazard - Disconnect or turn off power before servicing this instrument.
WARNING- EXPLOSION HAZARD- DO NOT REPLACE FUSE UNLESS POWER HAS
BEEN SWITCHED OFF OR THE AREA IS KNOWN TO BE NON-HAZARDOUS.
WARNING- EXPLOSION HAZARD- DO NOT DISCONNECT EQUIPMENT UNLESS
POWER HAS BEEN SWITCHED OFF OR THE AREA IS KNOWN TO BE NON-
HAZARDOUS.
Use a properly rated CERTIFIED AC power (mains) cable installed as per local or
national codes
A certified AC power (mains) disconnect or circuit breaker should be mounted
near the controller and installed following applicable local and national codes. If
a switch is used instead of a circuit breaker, a properly rate CERTIFIED fuse or
current limiter is required to be installed as per local or national codes. Markings
for positions of the switch or breaker should state (I) for on and (O) for off.
Clean only with a damp cloth without solvents.
Equipment not used as prescribed within this manual may impair overall safety.
!
!
This symbol is intended to alert the user to the presence of important
operating and maintenance (servicing) instructions.
This symbol is intended to alert the user to the presence of
dangerous voltage within the instrument enclosure that may be
sufficient magnitude to constitute a risk of electric shock.
!
!

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1.2GENERAL DESCRIPTION
The R. C. Systems Co. Inc. ST-72 64 channel Controller is designed to display and control
alarm event switching for up to 64 sensor data points. It may also be set as a 16, 32 or
48 channel controller for applications needing fewer inputs. Three programmable
standard alarms with features such as ON and OFF delays, Alarm Acknowledge, along
with dedicated horn and fault relays make the ST-72 well suited for many multi-point
monitoring applications. Data may be input to the ST-72 by optional analog inputs or via
the multiple communication ports. These communication ports are programmable so
the controller can be configured with multiple Master or Slave configurations. With a
Modbus RTU slave RS-485 port configured, sending data to PCs, PLCs, DCSs, or even
other ST-72 Controllers is available. The Ethernet port allows the unit to be a
ModbusTCP Master and Slave and also provides access to the embedded webpage.
Options such as analog I/O and discrete relays for each alarm are easily added to the
addressable I2C bus. Option boards have 16 channels and therefore require multiple
boards for 64 channel applications.
In addition to traditional analog and serial methods of providing monitored values, the
ST-72 is also capable of sending and receiving wireless data.
A color 320 x 240 pixel graphic LCD readout displays monitored data as bar graphs,
trends and engineering units. System configuration is through user friendly menus or
via the internal webpage that can be accessed through the Ethernet connection built
into the main I/O Board. All configuration data is retained in non-volatile memory
during power interruptions and can also be backed up and loaded using the SD card
located to the left of the display. The ST-72 front panel is shown below in Figure1-1
displaying the Combination screen. Additional data screens are shown in section 1.

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16, 32, 48, 64 Channel
Graphic Display & Alarm Controller
SD Card
Ch07
PCTLEL
Measurement Name
50
Min:0 Avg:32Max:95
Zero:0 Span:100
27 24 21 18 15 12 9 6 3m
100
80
60
40
20
0
Standard
Relay 1 Standard
Relay 2 Standard
Relay 3 Fault
Relay Horn
Relay
!
*DO NOT REMOVE
WHEN LED IS ON
Alarm
Reset
Next Edit
Menu
72-1020
Serial No.
2400 Counts
Figure1-1
1.3DATA DISPLAY SCREENS
The ST-72 Controller offers five distinct graphic displays for depicting the monitored
data. These are Main Data, 24 Hour Trend, Bar Graphs, Zone and Combination Screens.
Pressing
Menu
from any of these display screens will bring you to the Main Menu.
Pressing
Edit
from the Main Data, 24 Hour Trend or Combination Screens will skip the
Main Menu and bring you directly to the Channel Configuration Menu for the channel
that is selected.
1.3.1 MAIN DATA SCREEN
The ST-72 Main Data screen shown below (Figure1-1) displays all active channels at
once. It is capable of displaying 16, 32, 48 or 64 channels depending on the controller’s
configuration. This screen displays measurement name and uses a bar graph and
colored cells that flash with new alarms to indicate alarm conditions. Once the alarms

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have been acknowledged by an operator the cell will remain the appropriate color but
will stop flashing, showing the alarm has been acknowledged. Utilizing the Display
Alarm feature in the Systems Configuration menu allows new alarms to always force the
LCD to the Main Data screen. This is useful for applications requiring channels with new
alarms to be displayed.
While in the Main Data screen, use ///to highlight any cell and press
Edit
to go directly to that channel’s configuration menu or press
Next
twice to scroll
through that channel’s individual data screens. The exploded channel 38 in the example
below (Figure 1-2) indicates it is the channel selected and unused channels are grayed
out when turned off.
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
% Oxygen
Measurement
Measurement
ppm H2S
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Ppm H2S
Measurement
% Oxygen
Measurement
Measurement
Ch. 32 off
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
% Oxygen
Measurement
Measurement
Measurement
Measurement
Ch. 48 off
% Oxygen
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
% Oxygen
% Oxygen
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement
Measurement Name
46PCTLEL 38
Figure 1-2
Main Data Screen (64 Ch. Mode)

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1.3.2 24 HOUR TREND SCREEN
The ST-72 24 Hour Trend screen shown in Figure 1-3 displays a 24 hour trend of input
data for the channel selected. Vertical tic marks are each hour and horizontal tic marks
are each 10% of full scale. Colored lines indicate alarm levels. The alarm level lines have
triangles on the right end that indicate high and low trip for each alarm level. A triangle
that points up represents a high trip alarm and one that points down represents a low
trip alarm. Since each data point must be collected for several minutes before it may be
displayed, it is likely input values will fluctuate during this interval. Therefore, MAX,
MIN and AVERAGE values are stored in RAM memory for each subinterval. To
accurately portray the trend, a vertical line is drawn between MIN & MAX values for
each subinterval. The AVERAGE value pixel is then left blank, leaving a gap in the
vertical line. This is demonstrated in the noisy area of the 24 hour trend in Figure 1-3. If
the MAX & MIN values are within 2% of each other there is no need for the vertical line
and only the AVERAGE value pixel is darkened as in the quiet areas. If there is no trend
data available, the corresponding section of the graph will be grayed out. This will occur
on power interruptions.
The top portion of each trend screen indicates channel number, real time reading in
engineering units, measurement name, range, and MIN, MAX & AVERAGE values for the
preceding 24 hour period. When a channel reaches alarm state, the colored bar
changes to the color that represents that alarm level and flashes. Once the alarm is
acknowledged the bar stops flashing.
Measurement Name 45 ppmH2S
Zero: 0 Span: 100 10/20/2010
Min: 1 MAX: 82 Avg: 26
20Hr 16Hr 12Hr 8Hr 4Hr
100
80
60
40
20
0

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Figure 1-3
24 Hour Trend Screen
1.3.3 BAR GRAPHS SCREEN
The ST-72 Bar Graphs screen shown in Figure 1-4 allows 16 channels to be viewed
simultaneously. Both engineering units and bar graph values are indicated in real time.
Lines across the bars indicate the alarm trip points making it easy to identify channels
near alarm. The bar graph alarm lines have colored triangles on the bottom that
indicate alarm level and high or low trip for each alarm. A triangle that points right
represents a high trip alarm and one that points left represents a low trip alarm. When
a channel reaches alarm state, the bar graph changes to the color that represents that
alarm level and flashes. Once the alarm is acknowledged the bar stops flashing. If there
are more than 16 channels active the scroll bar along the right side of the screen
indicates channels not in the viewing area. If one of the channels not in the viewing
area goes into alarm the scroll bar arrow flashes the corresponding color of the alarm
indicating which direction the user must scroll to display it. This is demonstrated by the
top scroll bar arrow below.
Ch16
Ch17
Ch18
Ch19
Ch20
Ch21
Ch22
Ch23
Ch24
Ch25
Ch26
Ch27
Ch28
Ch29
Ch30
Ch31
2 ppmH2S
54 PCTLEL
18 PCTLEL
6 PCTLEL
4 ppmH2S
67 ppmH2S
28 PCTLEL
13.6 %O2
20.8 %O2
Fault
75 PSI
17 PCTLEL
38 ppmH2S
8 ppmH2S
15 PCTLEL
2 ppmH2S
Figure 1-4

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Bar Graphs Screen
1.3.4 COMBINATION SCREEN
The ST-72 Combination screen shown in Figure 1-5 offers a view of a single channel but
displays the data as a 30 minute trend, bar graph and large engineering units. The bar
graph and the background color changes and flashes indicating alarm condition. Once
the alarm is acknowledged they stop flashing. Colored lines across the bar graph and 30
minute trend indicate alarm levels. The alarm level lines have triangles on the right end
that indicate high and low trip for each alarm level. A triangle that points up represents
a high trip alarm and one that points down represents a low trip alarm. The
Combination Screen is also useful for testing inputs for stability since MAX, MIN &
AVERAGE values reset each time this screen is selected. For example, to test stability
over a one hour period for an input, begin timing as soon as the channel is selected.
One hour later record the MAX, MIN & AVERAGE values. The visible trend is only 30
minutes, but the difference between MAX & MIN indicates peak to peak excursions over
the one hour period and AVERAGE is the average for the hour. Longer or shorter tests
may also be run. A blue vertical line is drawn on the screen when the screen is selected
and moves to the left indicating how long this screen has been active. The example
below (Figure 1-5) has been active for 26 minutes.
Ch07
PCTLEL
2400 Counts
Measurement Name
50
Min:0Avg:32Max:90
Zero:0Span:100
27 24 21 18 15 12 9 6 3m
100
80
60
40
20
0
Figure 1-5
Combination Screen

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1.3.5 ZONE SCREEN
The ST-72 Zone screen displays the eight possible zones simultaneously. If an alarm
condition occurs the user will be able to quickly see in what zone the situation is
occurring. Each active zone is divided into alarm levels which are green until an alarm is
present. Inactive zones and alarm levels are grayed out. If an alarm should occur, the
zone name field will flash and the corresponding box in the assigned zone will turn the
color of the alarm that is present or alternate if two different colors are present. Once
the alarm has been acknowledged the name field will stop flashing. Utilizing the Display
Alarm feature in the Systems Configuration menu allows new alarms to always force the
LCD to the Zone screen. This is useful for applications requiring zones with alarms to be
displayed. If the Zone feature is not utilized this screen can be turned off in the Systems
Menu.
The Zone screen is also helpful for configuring the different zones. To display all the
channels included in any zone, press
Edit
while in the Zone screen. This will cause a
blue box to outline one of the zones. Use ///to select the correct
zone and press
Edit
again. The Main Data screen will appear with all the channels that
are included in the selected zone displayed in color and the channels that are not in the
selected zone grayed out. Any channel needed to be included or excluded from the
selected zone can be selected and configured from this screen.
North Entrance
A1 A2 A3 F
Control Room
A1 A2 A3 F
ZONE 8
A1 A2 A3 F
ZONE 7
A1 A2 A3 F
Main Process
A1 A2 A3 F
Switchgear Room
A1 A2 A3 F
Tank Farm
A1 A2 A3 F
West Gate
A1 A2 A3 F

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Figure 1-6
Zone Screen
1.4SPECIFICATIONS
1.4.1 DC POWER SUPPLY REQUIREMENTS
Standard ST-72 power requirements are 10-30VDC @ 12 watts applied to terminals 1 &
3(+) and 5 & 7(-) of TB4 on the standard I/O Board (see section 3.0). Optional features
increase power consumption as described below:
Discrete Relay Board option; add 6.5 watts per board (assumes all 16 relays are
energized).
Programmable Relay Board option; add 6.5 watts per board (assumes all 16 relays
are energized).
Analog Input Board option; add 1/2 watts per board plus transmitter power
consumption.
4-20mA Output Board option; add 2.5 watts per board.
Bridge Sensor Input Board option; add 3 watts max per board with eight 10-0192
modules installed (power consumption of the sensors not included).
Auxiliary Standard Relay Board option; add 2.5 watts.
Isolated Serial Expansion Board; add 1.5 watts.
TB4 terminals 2, 4, 6 & 8 of the standard I/O Board provide a maximum of 500mA
fused output power for powering of auxiliary external devices such as relays, lamps
or transmitters. Power consumed from these terminals should be considered when
calculating system power consumption.
1.4.1.1 600 WATT AC –24VDC POWER SUPPLY
*110-120 VAC @8.5A max
*220-240VAC @ 5A max
* Universal AC input automatically selects AC input range.
The 600 watt power supply (Figure 3-7) is for powering the ST-72 and up to 64
detectors. This power supply can be paralleled with up to three additional 600 watt
power supplies providing up to 2400 watts for applications with large power
requirements. It also features a built in DC-OK signal and remote on-off control.
1.4.1.2 150 WATT AC –24VDC POWER SUPPLY
*110-120 VAC @3.2A max

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*220-240VAC @ 1.6A max
* A slide switch on the front of the power supply selects AC input range.
The 10-0172 150 watt power supply (Figure 3-7) is for powering the ST-72 and up to 64
detectors.
1.4.1.3 RELAYS
The ST-72 comes standard with five Standard SPDT 5A relays, consisting of one
dedicated HORN and one dedicated FAULT relay plus 3 programmable alarm relays.
Programmable relays provide voting logic for ALARM 1, ALARM 2, and ALARM 3.
Discrete relays and additional Programmable relays are optional. All relays are rated at
5 Amp for 28 VDC and 250 ~VAC RESISTIVE loads.
IMPORTANT:Appropriate diode (DC loads) or MOV (AC loads) snubber devices
must be installed with inductive loads to prevent RFI noise spikes. Relay wiring should
be kept separate from low level signal wiring.
1.4.2 AMBIENT TEMPERATURE RANGE
-25 to 60 degrees C
1.4.3 HUMIDITY RANGE
0 TO 90% R. H. Non-Condensing.
1.4.4 ALTITUDE
Recommended up to 2000 meters
1.4.5 HOUSINGS
*General purpose panel mount weighing 7 lbs and including hardware for 19” rack
mounting (
Figure 6-1).
*NEMA 4X wall mount in fiberglass enclosure weighing 54 lbs (
Figure 6-2).
*Includes non-intrusive magnetic keypad.
1.4.6 NON-INTRUSIVE MAGNETIC KEYPAD
The ST-72 operator interface includes eight front panel touch keys
Menu
/
Alarm
Reset
/
Next
/
Edit
////. A magnetic keypad option offers these eight keys with adjacent
!

ST-72 User's Manual
Document: UM-1007 Revision Level A
11
magnetic keys. This option is included as a standard feature. It is useful in applications
where it may be inconvenient to open the enclosure’s door to access the touch keypad.
1.4.7 APPROVALS
C22.2 No. 142-M1987 - Process Control Equipment
CAN/CSA-C22.2 No.152-M1984 - Combustible Gas Detection Instruments
ANSI/ISA-12.13.01-2000 - Performance Requirements for Combustible Gas Detectors
CSA-C22.2 No. 213-M1987- Non-Incendive Electrical Equipment for Use in Class I,
Division 2 Hazardous Locations
UL Std No. 1604, Third Ed. - 1994 - Electrical Equipment for Use in Class I and II, Division
2; Class III Hazardous (Classified) Locations
ANSI/ISA-12.12.01-2010 - Non-Incendive Electrical Equipment for Use in Class I and II,
Division 2 and Class III, Divisions 1 and 2 Hazardous (Classified) Locations
CSA File # = 219995 and may be seen at: CSA-International.org.

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12
SECTION 2 BASIC OPERATION
The ST-72 offers 5 graphic screens for viewing monitored data and several Set-Up menu
screens for operator interface to configuration menus. The Main Data screen allows
viewing of all active channels simultaneously. The Trend screen displays a 24 hour trend
one channel at a time. The Combination screen displays a bar graph, large engineering
units and a 30 minute trend one channel at a time. The Zone screen displays the eight
possible zones simultaneously. Input channels may be displayed in sequence from the
Trend and Combination screens with /.
Next
switches between the 5 graphic
data screens. When ST-72 power is applied, the graphic LCD starts in the Main Data
screen.
2.1MAIN MENU CONFIGURATION
Variables inside Main menu tree allow optimum ST-72 configuration for a wide range of
demanding multi-point monitoring applications. The main menu is entered by pressing
Menu
Channel configuration menus are entered by pressing
Edit
from any channel’s data
screens, and scrolling to the desired menu using /. Pressing
Edit
again enters
the selected menu’s tree of variables. This Setup mode may be exited manually by
pressing
Next
or automatically when no keys are pressed for 5 minutes. Alarm relays
and front panel alarm LED indicators remain active during the Setup mode. A Security
menu offers a password feature to prevent tampering with ST-72 parameters. See
Figure 2-1 –Figure 2-7 for a complete ST-72 menu tree layout.

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13
Alarm Outputs
Standard Relay 2
Standard Relay 3
Horn/Piezo
Discrete Relay
Standard Relay 1
~
~
~
~
~
Main Menu
Channel Config
Communication Settings
Security: Unlocked
System
Diagnostics
Alarm Outputs
~
~
~
~
~
~
COM2 Settings
COM3 Settings
COM4 Settings
ModbusTCP Settings
Network Settings
COM1 Settings
~
~
~
~
~
~
Communication Settings
Horn/Piezo
Alarm 2
Alarm 3
Acknowledge
Failsafe
Piezo Alarm
Alarm 1
On
On
Yes
No
No
Beep
Discrete Relay
A2 Failsafe
A3 Failsafe
A1 Failsafe
No
No
No
Master Timeout(ms)
Master Poll Delay(ms)
Slave Byte Order
500
250
ABCD
ModbusTCP Settings
Hostname
Address
Netmask
Gateway
DHCP Enabled
Controller1
192.168.0.100
255.255.255.0
192.168.0.1
Yes
Network Settings
Lock Code
Modbus Lock Code
User Name
0
Default User
Security: Unlocked
Channel Config
Measurment Name Ch.38
46 PCTLEL
Measurment Name Ch.37
1 PCTLEL
Measurment Name Ch.39
6 PCTLEL
Discrete Relays
Programmable Relays
Analog Inputs
Analog outputs
Piezo
LEDs
Serial Ports
I/O Board Config
Standard Relays
~
~
~
~
~
~
~
~
~
Diagnostics
Standard Relay
A2 Votes Required
A3 Votes Required
Acknowledge
Failsafe
Zone 1
Override 1 Channel
A1 Votes Required
0
0
No
No
Yes
0
1
Standard Relay Menus are
Identical
Entering Diagnostics mode. Inputs will not
be processed. Alarm relays and analog
outputs may change, causing undesirable
states affecting equipment connected to
this controller.
Cancel (Next)
Ok (Edit)
Configure
Zone Names
SD Card
View Event Log
Clear Event Log
View Sensor Life
Version
~
~
~
~
~
~
v1.00
System
See Figure 2-2
See Figure 2-5/2-7
See Figure 2-4
BaudRate
Timeout (ms)
Poll Delay (ms)
Radio Setup
Function
9600
500
250
~
Modbus Master
COM1 Settings
COM1-4 Menus are Identical

ST-72 User's Manual
Document: UM-1007 Revision Level A
14
Figure 2-1
Channel 38 Config
Alarm 2
Alarm 3
Fault Alarm
Data From
Linearize
Configure
~
~
~
~
~
~
Alarm 1 ~
Ch. 38 Alarm 1
Latching
Trip On
On Delay (sec)
Off Delay (min)
Horn Drive
No
High
0
0
Yes
SetPoint 20
Ch. 38 Alarm 2
Latching
Trip On
On Delay (sec)
Off Delay (min)
Horn Drive
Color
No
High
0
0
Yes
Red
SetPoint 40
Ch. 38 Alarm 3
Latching
Trip On
On Delay (sec)
Off Delay (min)
Horn Drive
Color
Enabled?
No
High
0
0
Yes
Red
No
SetPoint 60
Ch. 38 Fault Alarm
SetPoint -10
800
4000
10
Board Default
~
Ch. 38 Data From
Min Raw
Max Raw
Filter Sample Count
Local Cal
Marker Menu
Src Analog Input
Ch. 38 Linearize
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
Input Output
Ch. 38 Configure
Engineering Units
Zero
Span
Decimal Points
Channel On?
Zone
Deadband (%)
Copy To Channel
Copy To Group
Restore Ch. Defaults
PCTLEL
0
100
0
Yes
1
1
~
~
~
Info Measurement Name
Channel Config
Measurment Name Ch.38
46 PCTLEL
Measurment Name Ch.37
1 PCTLEL
Measurment Name Ch.39
6 PCTLEL
See Figure 2-3
See Figure 2-3
See Figure 2-1
Figure 2-2
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