Sierra Monitor Corporation Sentry Controller Gas Detector User Manual
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
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