Sentry Controller
MODBUS Memory Map
(Enhanced)
December 15, 1998
Updated March 4, 2005
Sierra Monitor Corp. 1991 Tarob Ct. Milpitas, CA 95035 USA 408-262-6611, Toll Free 800-727-4377, FAX: 408-262-9042
Visit our Web Site: www.sierramonitor.com E-Mail: sierra@sierramonitor.com
Sentry Controller
MODBUS Memory Map
Detail
1 All Registers are MODBUS 16 bit registers
2 There are five different ways of using MODBUS registers (see italic reference number in left column for each
address)
2.1 As an Analog Value: In most cases these values are scaled by multiplying by 10.
2.2 As eight packed digital states, packed into one register. In this case the remaining 8 bits are unused.
2.3 As a digital state where the register value can only be “0” or “1”.
2.4 As a computed value, such as where “0” = no alarm, “1” = low alarm, “2” = high alarm.
2.5 Control registers, where the SCADA host can write a value, such as alarm reset to the Sentry, or to set
calibration concentration, or alarm set point. Note that these registers are read or write.
3 Where a series of registers apply only to sensor number 1, the following sequences for sensors 2, through 8 are
only referenced by the first applicable register number.
4 Some values can be found in more than one place in different formats. For example when Sensor Number 6 is in
high alarm and latched:
• Register 40001:5 is the bit which indicates present alarm condition.
• Register 40007:5 is the bit which indicate a latched condition, regardless of the present sensor reading (until
reset)
• Register 40466 is a computed value of “2”
Sentry MODBUS I/O Memory Map
5 Registers starting at 40224 provide the raw data read from each of the eight sensors. The following describes the
data for sensor 1, the remaining registers through 40463 are for sensors 2 through 8:
40224 Sensor 1 Input Value - Multiplex 0 – V0 (Reference value of 0 volts) 0 - 6553.5
40225 Sensor 1 Input Value - Multiplex 1 – Vsignal (Current sensor signal) 0 - 6553.5
40226 Sensor 1 Input Value - Multiplex 2 – CH2 (Auxiliary data by type) 0 - 6553.5
40227 Sensor 1 Input Value - Multiplex 3 – CH3(Auxiliary data by type) 0 - 6553.5
40228 Sensor 1 Input Value - Multiplex 4 – Type 0 - 6553.5
40229 Sensor 1 Input Value - Multiplex 5 – Vin (Channel voltage) 0 - 6553.5
40230 Sensor 1 Input Value - Multiplex 6 – Calibration Switch Position (0=On) 0 - 6553.5
40231 Sensor 1 Input Value - Multiplex 7 – Vref (Reference value of 2.5 volts) 0 - 6553.5
40232 Sensor 1 Calibration Due Days
To calculate the raw signal voltage (for example), since we know Vref :
V = (Vsignal – V0) / (Vref – V0) * 2.5v
March 4, 2005 Page: 1
Read Only Parameters
Modbus Address
Discrete
40001:0 High alarm bits - sensor 1
40001:1 High alarm bits - sensor 2
40001:2 High alarm bits - sensor 3
40001:3 High alarm bits - sensor 4
40001:4 High alarm bits - sensor 5
40001:5 High alarm bits - sensor 6
40001:6 High alarm bits - sensor 7
40001:7 High alarm bits - sensor 8
40002:0 Low alarm bits - sensor 1
40002:1 Low alarm bits - sensor 2
40002:2 Low alarm bits - sensor 3
40002:3 Low alarm bits - sensor 4
40002:4 Low alarm bits - sensor 5
40002:5 Low alarm bits - sensor 6
40002:6 Low alarm bits - sensor 7
40002:7 Low alarm bits - sensor 8
40003:0 Common (High or low) alarm bits - sensor 1
40003:1 Common (High or low) alarm bits - sensor 2
40003:2 Common (High or low) alarm bits - sensor 3
40003:3 Common (High or low) alarm bits - sensor 4
40003:4 Common (High or low) alarm bits - sensor 5
40003:5 Common (High or low) alarm bits - sensor 6
40003:6 Common (High or low) alarm bits - sensor 7
40003:7 Common (High or low) alarm bits - sensor 8
Parameter Units FIX EGU
Sentry MODBUS I/O Memory Map
40004:0 Common high alarm, any sensor
40004:1 Common low alarm, any sensor
40004:2 Common any alarm, any sensor
40004:3 Calibrate mode
40004:4 Trouble alarm
40004:5 Power Flash (Startup mode)
40005:0 Sensor in calibration – sensor 1
40005:1 Sensor in calibration – sensor 2
40005:2 Sensor in calibration – sensor 3
40005:3 Sensor in calibration – sensor 4
40005:4 Sensor in calibration – sensor 5
40005:5 Sensor in calibration – sensor 6
40005:6 Sensor in calibration – sensor 7
40005:7 Sensor in calibration – sensor 8
40006:0 Bits indicating analog value is valid – sensor 1
40006:1 Bits indicating analog value is valid – sensor 2
40006:2 Bits indicating analog value is valid – sensor 3
40006:3 Bits indicating analog value is valid – sensor 4
40006:4 Bits indicating analog value is valid – sensor 5
40006:5 Bits indicating analog value is valid – sensor 6
40006:6 Bits indicating analog value is valid – sensor 7
40006:7 Bits indicating analog value is valid – sensor 8
March 4, 2005 Page: 2
Modbus Address
40007:0 High alarm relay latched – sensor 1
40007:1 High alarm relay latched – sensor 2
40007:2 High alarm relay latched – sensor 3
40007:3 High alarm relay latched – sensor 4
40007:4 High alarm relay latched – sensor 5
40007:5 High alarm relay latched – sensor 6
40007:6 High alarm relay latched – sensor 7
40007:7 High alarm relay latched – sensor 8
40008:0 Low alarm relay latched – sensor 1
40008:1 Low alarm relay latched – sensor 2
40008:2 Low alarm relay latched – sensor 3
40008:3 Low alarm relay latched – sensor 4
40008:4 Low alarm relay latched – sensor 5
40008:5 Low alarm relay latched – sensor 6
40008:6 Low alarm relay latched – sensor 7
40008:7 Low alarm relay latched – sensor 8
40009:0 Common high/low alarm relay latched – sensor 1
40009:1 Common high/low alarm relay latched – sensor 2
40009:2 Common high/low alarm relay latched – sensor 3
40009:3 Common high/low alarm relay latched – sensor 4
40009:4 Common high/low alarm relay latched – sensor 5
40009:5 Common high/low alarm relay latched – sensor 6
40009:6 Common high/low alarm relay latched – sensor 7
40009:7 Common high/low alarm relay latched – sensor 8
Parameter Units FIX EGU
Sentry MODBUS I/O Memory Map
40011 Sensor 1 concentration % / PPM 0 - 6553.5
40012 Sensor 2 concentration % / PPM 0 - 6553.5
40013 Sensor 3 concentration % / PPM 0 - 6553.5
40014 Sensor 4 concentration % / PPM 0 - 6553.5
40015 Sensor 5 concentration % / PPM 0 - 6553.5
40016 Sensor 6 concentration % / PPM 0 - 6553.5
40017 Sensor 7 concentration % / PPM 0 - 6553.5
40018 Sensor 8 concentration % / PPM 0 - 6553.5
March 4, 2005 Page: 3
Modbus Address
40020:0 Sensor 1: Status 2 Sensor Disconnected (Trouble Bits)
Parameter Units FIX EGU
40020:2 Sensor 1: Voltage Regulator Failure
Sentry MODBUS I/O Memory Map
40020:3 Sensor 1: Sensor Bad
40020:4 Sensor 1: Duplicate Sensor
40020:5 Sensor 1: Timer Failure
40020:6 Sensor 1: Sensor Bridge Failure (CH
)
4
40020:7 Sensor 1: Type Error
40021:0 Sensor 1: Status 1 Enabled
40021:1 Sensor 1: Auto Calibration Enabled
40021:2 Sensor 1: Low Alarm Latch
40021:3 Sensor 1: Calibrated
40021:4 Sensor 1: Zone Option Enabled
40021:5 Sensor 1: Calibration Table Initialized
40021:6 Sensor 1: H
S Sensor Resistance too high
2
40021:7 Sensor 1: Operate Mode (as opposed to Warm Up Mode)
40022:0 Sensor 1: Status 4 High Alarm Latch
40022:1 Sensor 1: Low Sensitivity
40022:2 Sensor 1: Sensor not Valid
40024:0 Sensor 1: Concentration % / PPM 0 - 6553.5
40030:0 Sensor 2: Sensor Disconnected (Trouble Bits)
40030:2 Sensor 2: Voltage Regulator Failure
40030:3 Sensor 2: Sensor Bad
40030:4 Sensor 2: Duplicate Sensor
40030:5 Sensor 2: Timer Failure
40030:6 Sensor 2: Sensor Bridge Failure (Combustibles)
40030:7 Sensor 2: Type Error
40031:0 Sensor 2: Enabled
40031:1 Sensor 2: Auto Calibration Enabled
40031:2 Sensor 2: Low Alarm Latch
40031:3 Sensor 2: Calibrated
40031:4 Sensor 2: Zone Option Enabled
40031:5 Sensor 2: Calibration Table Initialized
40031:6 Sensor 2: H
40031:7 Sensor 2: Operate Mode (as opposed to Warm Up Mode)
40032:0 Sensor 2: High Alarm Latch
40032:1 Sensor 2: Low Sensitivity
40032:2 Sensor 2: Sensor not Valid
40034:0 Sensor 2: Concentration % / PPM 0 - 6553.5
S Sensor Resistance too high
2
March 4, 2005 Page: 4
Modbus Address
40040:0 Sensor 3: Sensor Disconnected (Trouble Bits)
40040:2 Sensor 3: Voltage Regulator Failure
40040:3 Sensor 3: Sensor Bad
40040:4 Sensor 3: Duplicate Sensor
40040:5 Sensor 3: Timer Failure
40040:6 Sensor 3: Sensor Bridge Failure (Combustibles)
40040:7 Sensor 3: Type Error
40041:0 Sensor 3: Enabled
40041:1 Sensor 3: Auto Calibration Enabled
40041:2 Sensor 3: Low Alarm Latch
40041:3 Sensor 3: Calibrated
40041:4 Sensor 3: Zone Option Enabled
40041:5 Sensor 3: Calibration Table Initialized
40041:6 Sensor 3: H
40041:7 Sensor 3: Operate Mode (as opposed to Warm Up Mode)
40042:0 Sensor 3: High Alarm Latch
40042:1 Sensor 3: Low Sensitivity
40042:2 Sensor 3: Sensor not Valid
40044:0 Sensor 3: Concentration % / PPM 0 - 6553.5
Parameter Units FIX EGU
2
S Sensor Resistance too high
40050:0 Sensor 4: Sensor Disconnected (Trouble Bits)
40050:2 Sensor 4: Voltage Regulator Failure
40050:3 Sensor 4: Sensor Bad
40050:4 Sensor 4: Duplicate Sensor
40050:5 Sensor 4: Timer Failure
40050:6 Sensor 4: Sensor Bridge Failure (Combustibles)
40050:7 Sensor 4: Type Error
40051:0 Sensor 4: Enabled
40051:1 Sensor 4: Auto Calibration Enabled
40051:2 Sensor 4: Low Alarm Latch
40051:3 Sensor 4: Calibrated
40051:4 Sensor 4: Zone Option Enabled
40051:5 Sensor 4: Calibration Table Initialized
Sentry MODBUS I/O Memory Map
40051:6 Sensor 4: H
40051:7 Sensor 4: Operate Mode (as opposed to Warm Up Mode)
40052:0 Sensor 4: High Alarm Latch
40052:1 Sensor 4: Low Sensitivity
40052:2 Sensor 4: Sensor not Valid
40054:0 Sensor 4: Concentration % / PPM 0 - 6553.5
S Sensor Resistance too high
2
March 4, 2005 Page: 5
Modbus Address
Parameter Units FIX EGU
40060:0 Sensor 5: Sensor Disconnected (Trouble Bits)
Sentry MODBUS I/O Memory Map
40060:2 Sensor 5: Voltage Regulator Failure
40060:3 Sensor 5: Sensor Bad
40060:4 Sensor 5: Duplicate Sensor
40060:5 Sensor 5: Timer Failure
40060:6 Sensor 5: Sensor Bridge Failure (Combustibles)
40060:7 Sensor 5: Type Error
40061:0 Sensor 5: Enabled
40061:1 Sensor 5: Auto Calibration Enabled
40061:2 Sensor 5: Low Alarm Latch
40061:3 Sensor 5: Calibrated
40061:4 Sensor 5: Zone Option Enabled
40061:5 Sensor 5: Calibration Table Initialized
40061:6 Sensor 5: H
40061:7 Sensor 5: Operate Mode (as opposed to Warm Up Mode)
40062:0 Sensor 5: High Alarm Latch
40062:1 Sensor 5: Low Sensitivity
40062:2 Sensor 5: Sensor not Valid
40064:0 Sensor 5:Concentration % / PPM 0 - 6553.5
S Sensor Resistance too high
2
40070:0 Sensor 6: Sensor Disconnected (Trouble Bits)
40070:2 Sensor 6: Voltage Regulator Failure
40070:3 Sensor 6: Sensor Bad
40070:4 Sensor 6: Duplicate Sensor
40070:5 Sensor 6: Timer Failure
40070:6 Sensor 6: Sensor Bridge Failure (Combustibles)
40070:7 Sensor 6: Type Error
40071:0 Sensor 6: Enabled
40071:1 Sensor 6: Auto Calibration Enabled
40071:2 Sensor 6: Low Alarm Latch
40071:3 Sensor 6: Calibrated
40071:4 Sensor 6: Zone Option Enabled
40071:5 Sensor 6: Calibration Table Initialized
40071:6 Sensor 6: H
40071:7 Sensor 6: Operate Mode (as opposed to Warm Up Mode)
40072:0 Sensor 6: High Alarm Latch
40072:1 Sensor 6: Low Sensitivity
40072:2 Sensor 6: Sensor not Valid
40074:0 Sensor 6: Concentration % / PPM 0 - 6553.5
S Sensor Resistance too high
2
March 4, 2005 Page: 6
Modbus Address
Sentry MODBUS I/O Memory Map
Parameter Units FIX EGU
40080:0
40080:2 Sensor 7: Voltage Regulator Failure
40080:3 Sensor 7: Sensor Bad
40080:4 Sensor 7: Duplicate Sensor
40080:5 Sensor 7: Timer Failure
40080:6 Sensor 7: Sensor Bridge Failure (Combustibles)
40080:7 Sensor 7: Type Error
40081:0 Sensor 7: Enabled
40081:1 Sensor 7: Auto Calibration Enabled
40081:2 Sensor 7: Low Alarm Latch
40081:3 Sensor 7: Calibrated
40081:4 Sensor 7: Zone Option Enabled
40081:5 Sensor 7: Calibration Table Initialized
40081:6 Sensor 7: H
40081:7 Sensor 7: Operate Mode (as opposed to Warm Up Mode)
40082:0 Sensor 7: High Alarm Latch
40082:1 Sensor 7: Low Sensitivity
40082:2 Sensor 7: Sensor not Valid
40084:0 Sensor 7: Concentration % / PPM 0 - 6553.5
Sensor 7: Sensor Disconnected (Trouble Bits)
S Sensor Resistance too high
2
40090:0 Sensor 8: Sensor Disconnected (Trouble Bits)
40090:2 Sensor 8: Voltage Regulator Failure
40090:3 Sensor 8: Sensor Bad
40090:4 Sensor 8: Duplicate Sensor
40090:5 Sensor 8: Timer Failure
40090:6 Sensor 8: Sensor Bridge Failure (Combustibles)
40090:7 Sensor 8: Type Error
40091:0 Sensor 8: Enabled
40091:1 Sensor 8: Auto Calibration Enabled
40091:2 Sensor 8: Low Alarm Latch
40091:3 Sensor 8: Calibrated
40091:4 Sensor 8: Zone Option Enabled
40091:5 Sensor 8: Calibration Table Initialized
40091:6 Sensor 8: H
40091:7 Sensor 8: Operate Mode (as opposed to Warm Up Mode)
40092:0 Sensor 8: High Alarm Latch
40092:1 Sensor 8: Low Sensitivity
40092:2 Sensor 8: Sensor not Valid
40094:0 Sensor 8: Concentration % / PPM 0 - 6553.5
S Sensor Resistance too high
2
March 4, 2005 Page: 7
Analog Process Variables
Sentry MODBUS I/O Memory Map
Modbus Address
Parameter Units FIX EGU
40111 Sensor 1 concentration % / PPM 0 - 6553.5
40112 Sensor 2 concentration % / PPM 0 - 6553.5
40113 Sensor 3 concentration % / PPM 0 - 6553.5
40114 Sensor 4 concentration % / PPM 0 - 6553.5
40115 Sensor 5 concentration % / PPM 0 - 6553.5
40116 Sensor 6 concentration % / PPM 0 - 6553.5
40117 Sensor 7 concentration % / PPM 0 - 6553.5
40118 Sensor 8 concentration % / PPM 0 - 6553.5
40119 Sensor 1 Highest Concentration
40120 Sensor 2 Highest Concentration
40121 Sensor 3 Highest Concentration
40122 Sensor 4 Highest Concentration
40123 Sensor 5 Highest Concentration
40124 Sensor 6 Highest Concentration
40125 Sensor 7 Highest Concentration
40126 Sensor 8 Highest Concentration
40127 Sensor 1 Lowest Concentration
40128 Sensor 2 Lowest Concentration
40129 Sensor 3 Lowest Concentration
40130 Sensor 4 Lowest Concentration
40131 Sensor 5 Lowest Concentration
40132 Sensor 6 Lowest Concentration
40133 Sensor 7 Lowest Concentration
40134 Sensor 8 Lowest Concentration
40135 Sensor 1 Maximum Input value (Voltage)
40136 Sensor 2 Maximum Input value (Voltage)
40137 Sensor 3 Maximum Input value (Voltage)
40138 Sensor 4 Maximum Input value (Voltage)
40139 Sensor 5 Maximum Input value (Voltage)
40140 Sensor 6 Maximum Input value (Voltage)
40141 Sensor 7 Maximum Input value (Voltage)
40142 Sensor 8 Maximum Input value (Voltage)
40143 Sensor 1 Minimum Input value (Voltage)
40144 Sensor 2 Minimum Input value (Voltage)
40145 Sensor 3 Minimum Input value (Voltage)
40146 Sensor 4 Minimum Input value (Voltage)
40147 Sensor 5 Minimum Input value (Voltage)
40148 Sensor 6 Minimum Input value (Voltage)
40149 Sensor 7 Minimum Input value (Voltage)
40150 Sensor 8 Minimum Input value (Voltage)
40151 Sensor 1 Power (H
40152 Sensor 2 Power (H
40153 Sensor 3 Power (H
40154 Sensor 4 Power (H
40155 Sensor 5 Power (H
S and COMB only )
2
S and COMB only )
2
S and COMB only )
2
S and COMB only )
2
S and COMB only )
2
March 4, 2005 Page: 8
Modbus Address
Sentry MODBUS I/O Memory Map
Parameter Units FIX EGU
40156 Sensor 6 Power (H
40157 Sensor 7 Power (H
40158
Sensor 8 Power (H
S and COMB only )
2
S and COMB only )
2
S and COMB only )
2
40159 Sensor 1 Type (1,2,3 or 4)
40160 Sensor 2 Type (1,2,3 or 4)
40161 Sensor 3 Type (1,2,3 or 4)
40162 Sensor 4 Type (1,2,3 or 4)
40163 Sensor 5 Type (1,2,3 or 4)
40164 Sensor 6 Type (1,2,3 or 4)
40165 Sensor 7 Type (1,2,3 or 4)
40166 Sensor 8 Type (1,2,3 or 4)
40170 System Historical Reset Time Month
40171 System Historical Reset Time Day
40172 System Historical Reset Time Hr
40173 System Historical Reset Time Min
40174 System Power Up Time Month
40175 System Power Up Time Day
40176 System Power Up Time Hr
40177 System Power Up Time Min
40178 System Power Down Time Month
40179 System Power Down Time Day
40180 System Power Down Time Hr
40181 System Power Down Time Min
40200 Sensor 1 High Alarm Time Month
40201 Sensor 1 High Alarm Time Day
40202 Sensor 1 High Alarm Time Hr
40203 Sensor 1 High Alarm Time Min
40204 Sensor 1 Low Alarm Time Month
40205 Sensor 1 Low Alarm Time Day
40206 Sensor 1 Low Alarm Time Hr
40207 Sensor 1 Low Alarm Time Min
40208 Sensor 1 Calibration Time Month
40209 Sensor 1 Calibration Time Day
40210 Sensor 1 Calibration Time Hr
40211 Sensor 1 Calibration Time Min
40212 Sensor 1 High Conc. Time Month
40213 Sensor 1 High Conc. Time Day
40214 Sensor 1 High Conc. Time Hr
40215 Sensor 1 High Conc. Time Min
40216 Sensor 1 Low Conc. Time Month
40217 Sensor 1 Low Conc. Time Day
40218 Sensor 1 Low Conc. Time Hr
40219 Sensor 1 Low Conc. Time Min
40220 Sensor 1 Trouble Time Month
40221 Sensor 1 Trouble Time Day
40222 Sensor 1 Trouble Time Hr
40223 Sensor 1 Trouble Time Min
March 4, 2005 Page: 9
Sentry MODBUS I/O Memory Map
Modbus Address
Parameter Units FIX EGU
40224 Sensor 1 Input Value - Multiplex 0 0 - 6553.5
40225 Sensor 1 Input Value - Multiplex 1 0 - 6553.5
40226 Sensor 1 Input Value - Multiplex 2 0 - 6553.5
40227 Sensor 1 Input Value - Multiplex 3 0 - 6553.5
40228 Sensor 1 Input Value - Multiplex 4 0 - 6553.5
40229 Sensor 1 Input Value - Multiplex 5 0 - 6553.5
40230 Sensor 1 Input Value - Multiplex 6 0 - 6553.5
40231 Sensor 1 Input Value - Multiplex 7 0 - 6553.5
40232 Sensor 1 Calibration Due Days
40233 Sensor 2 High Alarm Time Month
40234 Sensor 2 High Alarm Time Day
40235 Sensor 2 High Alarm Time Hr
40236 Sensor 2 High Alarm Time Min
40237 Sensor 2 Low Alarm Time Month
40238 Sensor 2 Low Alarm Time Day
40239 Sensor 2 Low Alarm Time Hr
40240 Sensor 2 Low Alarm Time Min
40241 Sensor 2 Calibration Time Month
40242 Sensor 2 Calibration Time Day
40243 Sensor 2 Calibration Time Hr
40244 Sensor 2 Calibration Time Min
40245 Sensor 2 High Conc. Time Month
40246 Sensor 2 High Conc. Time Day
40247 Sensor 2 High Conc. Time Hr
40248 Sensor 2 High Conc. Time Min
40249 Sensor 2 Low Conc. Time Month
40250 Sensor 2 Low Conc. Time Day
40251 Sensor 2 Low Conc. Time Hr
40252 Sensor 2 Low Conc. Time Min
40253 Sensor 2 Trouble Time Month
40254 Sensor 2 Trouble Time Day
40255 Sensor 2 Trouble Time Hr
40256 Sensor 2 Trouble Time Min
40257 Sensor 2 Input Value - Multiplex 0 0 - 6553.5
40258 Sensor 2 Input Value - Multiplex 1 0 - 6553.5
40259 Sensor 2 Input Value - Multiplex 2 0 - 6553.5
40260 Sensor 2 Input Value - Multiplex 3 0 - 6553.5
40261 Sensor 2 Input Value - Multiplex 4 0 - 6553.5
40262 Sensor 2 Input Value - Multiplex 5 0 - 6553.5
40263 Sensor 2 Input Value - Multiplex 6 0 - 6553.5
40264 Sensor 2 Input Value - Multiplex 7 0 - 6553.5
40265 Sensor 2 Calibration Due Days
March 4, 2005 Page: 10
Modbus Address
Parameter Units FIX EGU
40266 Sensor 3 High Alarm Time Month
40267 Sensor 3 High Alarm Time Day
40268 Sensor 3 High Alarm Time Hr
40269 Sensor 3 High Alarm Time Min
40270 Sensor 3 Low Alarm Time Month
40271 Sensor 3 Low Alarm Time Day
40272 Sensor 3 Low Alarm Time Hr
40273 Sensor 3 Low Alarm Time Min
40274 Sensor 3 Calibration Time Month
40275 Sensor 3 Calibration Time Day
40276 Sensor 3 Calibration Time Hr
40277 Sensor 3 Calibration Time Min
40278 Sensor 3 High Conc. Time Month
40279 Sensor 3 High Conc. Time Day
40280 Sensor 3 High Conc. Time Hr
40281 Sensor 3 High Conc. Time Min
40282 Sensor 3 Low Conc. Time Month
40283 Sensor 3 Low Conc. Time Day
40284 Sensor 3 Low Conc. Time Hr
40285 Sensor 3 Low Conc. Time Min
Sentry MODBUS I/O Memory Map
40286 Sensor 3 Trouble Time Month
40287 Sensor 3 Trouble Time Day
40288 Sensor 3 Trouble Time Hr
40289 Sensor 3 Trouble Time Min
40290 Sensor 3 Input Value - Multiplex 0 0 - 6553.5
40291 Sensor 3 Input Value - Multiplex 1 0 - 6553.5
40292 Sensor 3 Input Value - Multiplex 2 0 - 6553.5
40293 Sensor 3 Input Value - Multiplex 3 0 - 6553.5
40294 Sensor 3 Input Value - Multiplex 4 0 - 6553.5
40295 Sensor 3 Input Value - Multiplex 5 0 - 6553.5
40296 Sensor 3 Input Value - Multiplex 6 0 - 6553.5
40297 Sensor 3 Input Value - Multiplex 7 0 - 6553.5
40298 Sensor 3 Calibration Due Days
40299 Sensor 4 High Alarm Time Month
40300 Sensor 4 High Alarm Time Day
40301 Sensor 4 High Alarm Time Hr
40302 Sensor 4 High Alarm Time Min
40303 Sensor 4 Low Alarm Time Month
40304 Sensor 4 Low Alarm Time Day
40305 Sensor 4 Low Alarm Time Hr
40306 Sensor 4 Low Alarm Time Min
40307 Sensor 4 Calibration Time Month
40308 Sensor 4 Calibration Time Day
40309 Sensor 4 Calibration Time Hr
40310 Sensor 4 Calibration Time Min
March 4, 2005 Page: 11
Modbus Address
Parameter Units FIX EGU
40311 Sensor 4 High Conc. Time Month
40312 Sensor 4 High Conc. Time Day
40313 Sensor 4 High Conc. Time Hr
40314 Sensor 4 High Conc. Time Min
40315 Sensor 4 Low Conc. Time Month
40316 Sensor 4 Low Conc. Time Day
40317 Sensor 4 Low Conc. Time Hr
40318 Sensor 4 Low Conc. Time Min
40319 Sensor 4 Trouble Time Month
40320 Sensor 4 Trouble Time Day
40321 Sensor 4 Trouble Time Hr
40322 Sensor 4 Trouble Time Min
40323 Sensor 4 Input Value - Multiplex 0 0 - 6553.5
40324 Sensor 4 Input Value - Multiplex 1 0 - 6553.5
40325 Sensor 4 Input Value - Multiplex 2 0 - 6553.5
40326 Sensor 4 Input Value - Multiplex 3 0 - 6553.5
40327 Sensor 4 Input Value - Multiplex 4 0 - 6553.5
40328 Sensor 4 Input Value - Multiplex 5 0 - 6553.5
40329 Sensor 4 Input Value - Multiplex 6 0 - 6553.5
40330 Sensor 4 Input Value - Multiplex 7 0 - 6553.5
Sentry MODBUS I/O Memory Map
40331 Sensor 4 Calibration Due Days
40332 Sensor 5 High Alarm Time Month
40333 Sensor 5 High Alarm Time Day
40334 Sensor 5 High Alarm Time Hr
40335 Sensor 5 High Alarm Time Min
40336 Sensor 5 Low Alarm Time Month
40337 Sensor 5 Low Alarm Time Day
40338 Sensor 5 Low Alarm Time Hr
40339 Sensor 5 Low Alarm Time Min
40340 Sensor 5 Calibration Time Month
40341 Sensor 5 Calibration Time Day
40342 Sensor 5 Calibration Time Hr
40343 Sensor 5 Calibration Time Min
40344 Sensor 5 High Conc. Time Month
40345 Sensor 5 High Conc. Time Day
40346 Sensor 5 High Conc. Time Hr
40347 Sensor 5 High Conc. Time Min
40348 Sensor 5 Low Conc. Time Month
40349 Sensor 5 Low Conc. Time Day
40350 Sensor 5 Low Conc. Time Hr
40351 Sensor 5 Low Conc. Time Min
40352 Sensor 5 Trouble Time Month
40353 Sensor 5 Trouble Time Day
40354 Sensor 5 Trouble Time Hr
40355 Sensor 5 Trouble Time Min
March 4, 2005 Page: 12
Modbus Address
Parameter Units FIX EGU
40356 Sensor 5 Input Value - Multiplex 0 0 - 6553.5
40357 Sensor 5 Input Value - Multiplex 1 0 - 6553.5
40358 Sensor 5 Input Value - Multiplex 2 0 - 6553.5
40359 Sensor 5 Input Value - Multiplex 3 0 - 6553.5
40360 Sensor 5 Input Value - Multiplex 4 0 - 6553.5
40361 Sensor 5 Input Value - Multiplex 5 0 - 6553.5
40362 Sensor 5 Input Value - Multiplex 6 0 - 6553.5
40363 Sensor 5 Input Value - Multiplex 7 0 - 6553.5
Sentry MODBUS I/O Memory Map
40364 Sensor 5 Calibration Due Days
40365 Sensor 6 High Alarm Time Month
40366 Sensor 6 High Alarm Time Day
40367 Sensor 6 High Alarm Time Hr
40368 Sensor 6 High Alarm Time Min
40369 Sensor 6 Low Alarm Time Month
40370 Sensor 6 Low Alarm Time Day
40371 Sensor 6 Low Alarm Time Hr
40372 Sensor 6 Low Alarm Time Min
40373 Sensor 6 Calibration Time Month
40374 Sensor 6 Calibration Time Day
40375 Sensor 6 Calibration Time Hr
40376 Sensor 6 Calibration Time Min
40377 Sensor 6 High Conc. Time Month
40378 Sensor 6 High Conc. Time Day
40379 Sensor 6 High Conc. Time Hr
40380 Sensor 6 High Conc. Time Min
40381 Sensor 6 Low Conc. Time Month
40382 Sensor 6 Low Conc. Time Day
40383 Sensor 6 Low Conc. Time Hr
40384 Sensor 6 Low Conc. Time Min
40385 Sensor 6 Trouble Time Month
40386 Sensor 6 Trouble Time Day
40387 Sensor 6 Trouble Time Hr
40388 Sensor 6 Trouble Time Min
40389 Sensor 6 Input Value - Multiplex 0 0 - 6553.5
40390 Sensor 6 Input Value - Multiplex 1 0 - 6553.5
40391 Sensor 6 Input Value - Multiplex 2 0 - 6553.5
40392 Sensor 6 Input Value - Multiplex 3 0 - 6553.5
40393 Sensor 6 Input Value - Multiplex 4 0 - 6553.5
40394 Sensor 6 Input Value - Multiplex 5 0 - 6553.5
40395 Sensor 6 Input Value - Multiplex 6 0 - 6553.5
40396 Sensor 6 Input Value - Multiplex 7 0 - 6553.5
40397 Sensor 6 Calibration Due Days
March 4, 2005 Page: 13
Modbus Address
Parameter Units FIX EGU
40398 Sensor 7 High Alarm Time Month
40399 Sensor 7 High Alarm Time Day
40400 Sensor 7 High Alarm Time Hr
40401 Sensor 7 High Alarm Time Min
40402 Sensor 7 Low Alarm Time Month
40403 Sensor 7 Low Alarm Time Day
40404 Sensor 7 Low Alarm Time Hr
40405 Sensor 7 Low Alarm Time Min
40406 Sensor 7 Calibration Time Month
40407 Sensor 7 Calibration Time Day
40408 Sensor 7 Calibration Time Hr
40409 Sensor 7 Calibration Time Min
40410 Sensor 7 High Conc. Time Month
40411 Sensor 7 High Conc. Time Day
40412 Sensor 7 High Conc. Time Hr
40413 Sensor 7 High Conc. Time Min
40414 Sensor 7 Low Conc. Time Month
40415 Sensor 7 Low Conc. Time Day
40416 Sensor 7 Low Conc. Time Hr
40417 Sensor 7 Low Conc. Time Min
Sentry MODBUS I/O Memory Map
40418 Sensor 7 Trouble Time Month
40419 Sensor 7 Trouble Time Day
40420 Sensor 7 Trouble Time Hr
40421 Sensor 7 Trouble Time Min
40422 Sensor 7 Input Value - Multiplex 0 0 - 6553.5
40423 Sensor 7 Input Value - Multiplex 1 0 - 6553.5
40424 Sensor 7 Input Value - Multiplex 2 0 - 6553.5
40425 Sensor 7 Input Value - Multiplex 3 0 - 6553.5
40426 Sensor 7 Input Value - Multiplex 4 0 - 6553.5
40427 Sensor 7 Input Value - Multiplex 5 0 - 6553.5
40428 Sensor 7 Input Value - Multiplex 6 0 - 6553.5
40429 Sensor 7 Input Value - Multiplex 7 0 - 6553.5
40430 Sensor 7 Calibration Due Days
40431 Sensor 8 High Alarm Time Month
40432 Sensor 8 High Alarm Time Day
40433 Sensor 8 High Alarm Time Hr
40434 Sensor 8 High Alarm Time Min
40435 Sensor 8 Low Alarm Time Month
40436 Sensor 8 Low Alarm Time Day
40437 Sensor 8 Low Alarm Time Hr
40438 Sensor 8 Low Alarm Time Min
40439 Sensor 8 Calibration Time Month
40440 Sensor 8 Calibration Time Day
40441 Sensor 8 Calibration Time Hr
40442 Sensor 8 Calibration Time Min
March 4, 2005 Page: 14
Modbus Address
Parameter Units FIX EGU
40443 Sensor 8 High Conc. Time Month
40444 Sensor 8 High Conc. Time Day
40445 Sensor 8 High Conc. Time Hr
40446 Sensor 8 High Conc. Time Min
40447 Sensor 8Low Conc. Time Month
40448 Sensor 8 Low Conc. Time Day
40449 Sensor 8 Low Conc. Time Hr
40450 Sensor 8 Low Conc. Time Min
40451 Sensor 8 Trouble Time Month
40452 Sensor 8 Trouble Time Day
40453 Sensor 8 Trouble Time Hr
40454 Sensor 8 Trouble Time Min
40455 Sensor 8 Input Value - Multiplex 0 0 - 6553.5
40456 Sensor 8 Input Value - Multiplex 1 0 - 6553.5
40457 Sensor 8 Input Value - Multiplex 2 0 - 6553.5
40458 Sensor 8 Input Value - Multiplex 3 0 - 6553.5
40459 Sensor 8 Input Value - Multiplex 4 0 - 6553.5
40460 Sensor 8 Input Value - Multiplex 5 0 - 6553.5
40461 Sensor 8 Input Value - Multiplex 6 0 - 6553.5
40462 Sensor 8 Input Value - Multiplex 7 0 - 6553.5
Sentry MODBUS I/O Memory Map
40463 Sensor 8 Calibration Due Days
40466 Contrived alarm - Sensor 1 - 0 = no alarm, 1 = Low alarm, 2 = High alarm
40467 Contrived alarm - Sensor 2 - 0 = no alarm, 1 = Low alarm, 2 = High alarm
40468 Contrived alarm - Sensor 3 - 0 = no alarm, 1 = Low alarm, 2 = High alarm
40469 Contrived alarm - Sensor 4 - 0 = no alarm, 1 = Low alarm, 2 = High alarm
40470 Contrived alarm - Sensor 5 - 0 = no alarm, 1 = Low alarm, 2 = High alarm
40471 Contrived alarm - Sensor 6 - 0 = no alarm, 1 = Low alarm, 2 = High alarm
40472 Contrived alarm - Sensor 7 - 0 = no alarm, 1 = Low alarm, 2 = High alarm
40473 Contrived alarm - Sensor 8 - 0 = no alarm, 1 = Low alarm, 2 = High alarm
March 4, 2005 Page: 15
Read/Write Parameters
High Alarm Limits
Sentry MODBUS I/O Memory Map
Modbus Address
Parameter Units FIX EGU
40501 Sensor 1 % / PPM 0 - 65535
40502 Sensor 2 % / PPM 0 - 65535
40503 Sensor 3 % / PPM 0 - 65535
40504 Sensor 4 % / PPM 0 - 65535
40505 Sensor 5 % / PPM 0 - 65535
40506 Sensor 6 % / PPM 0 - 65535
40507 Sensor 7 % / PPM 0 - 65535
40508 Sensor 8 % / PPM 0 - 65535
Low Alarm Limits
40511 Sensor 1 % / PPM 0 - 65535
40512 Sensor 2 % / PPM 0 - 65535
40513 Sensor 3 % / PPM 0 - 65535
40514 Sensor 4 % / PPM 0 - 65535
40515 Sensor 5 % / PPM 0 - 65535
40516 Sensor 6 % / PPM 0 - 65535
40517 Sensor 7 % / PPM 0 - 65535
40518 Sensor 8 % / PPM 0 - 65535
H
S/CH4/Oxy/CO
2
40520 Sensor 1 Calib. Coeff. 1 k1 ccn ccn ccn
40521 2 k2 vmin vmax vmin
40522 3 k3 vmax - vmax
40523 4 n1 gasfac - -
40524 5 n2 - - -
40525 6 n3 - - -
40526 7 bp12 - - -
40527 8 bp23 - - -
40528 9 ccn - - -
40530 Sensor 2 Calib. Coeff. 1 k1 ccn ccn ccn
40521 2 k2 vmin vmax vmin
40532 3 k3 vmax - vmax
40533 4 n1 gasfac - -
40534 5 n2 - - -
40535 6 n3 - - -
40536 7 bp12 - - -
40537 8 bp23 - - -
40538 9 ccn - - -
40540 Sensor 3 Calib. Coeff. 1 k1 ccn ccn ccn
40541 2 k2 vmin vmax vmin
40542 3 k3 vmax - vmax
40543 4 n1 gasfac - -
40544 5 n2 - - -
40545 6 n3 - - -
40546 7 bp12 - - -
40547 8 bp23 - - -
40548 9 ccn - - -
March 4, 2005 Page: 16
40550 Sensor 4 Calib. Coeff. 1 k1 ccn ccn ccn
40551 2 k2 vmin vmax vmin
40552 3 k3 vmax - vmax
40553 4 n1 gasfac - -
40554 5 n2 - - -
40555 6 n3 - - -
40556 7 bp12 - - -
40557 8 bp23 - - -
40558 9 ccn - - -
Sentry MODBUS I/O Memory Map
40560 Sensor 5 Calib. Coeff. 1 k1 ccn ccn ccn
40561 2 k2 vmin vmax vmin
40562 3 k3 vmax - vmax
40563 4 n1 gasfac - -
40564 5 n2 - - -
40565 6 n3 - - -
40566 7 bp12 - - -
40567 8 bp23 - - -
40568 9 ccn - - -
40570 Sensor 6 Calib. Coeff. 1 k1 ccn ccn ccn
40571 2 k2 vmin vmax vmin
40572 3 k3 vmax - vmax
40573 4 n1 gasfac - -
40574 5 n2 - - -
40575 6 n3 - - -
40576 7 bp12 - - -
40577 8 bp23 - - -
40578 9 ccn - - -
40580 Sensor 7 Calib. Coeff. 1 k1 ccn ccn ccn
40581 2 k2 vmin vmax vmin
40582 3 k3 vmax - vmax
40583 4 n1 gasfac - -
40584 5 n2 - - -
40585 6 n3 - - -
40586 7 bp12 - - -
40587 8 bp23 - - -
40588 9 ccn - - -
40590 Sensor 8 Calib. Coeff. 1 k1 ccn ccn ccn
40591 2 k2 vmin vmax vmin
40592 3 k3 vmax - vmax
40593 4 n1 gasfac - -
40594 5 n2 - - -
40595 6 n3 - - -
40596 7 bp12 - - -
40597 8 bp23 - - -
40598 9 ccn - - -
March 4, 2005 Page: 17
Control Bits
Sentry MODBUS I/O Memory Map
Modbus Address
Parameter Units FIX EGU
40601 System Reset
40602 Alarm Reset
40603 History Reset
40610 System Time Month
40611 System Time Day
40612 System Time Hr
40613 System Time Min
40614 Latch High Alarms - Sensor 1
40615 Latch High Alarms - Sensor 2
40616 Latch High Alarms - Sensor 3
40617 Latch High Alarms - Sensor 4
40618 Latch High Alarms - Sensor 5
40619 Latch High Alarms - Sensor 6
40620 Latch High Alarms - Sensor 7
40621 Latch High Alarms - Sensor 8
40622 Latch Low Alarms - Sensor 1
40623 Latch Low Alarms - Sensor 2
40624 Latch Low Alarms - Sensor 3
40625 Latch Low Alarms - Sensor 4
40626 Latch Low Alarms - Sensor 5
40627 Latch Low Alarms - Sensor 6
40628 Latch Low Alarms - Sensor 7
40629 Latch Low Alarms - Sensor 8
40631 Calibration Concentration Comb (Type 2)
40632 Calibration Concentration Oxy (Type 3)
40633 Calibration Concentration Toxic (Type 4)
March 4, 2005 Page: 18
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