MSA General Monitors S4100C - Modbus Register Configuration; Register 3

Model S4100C
33
8.5 Modbus Register Configuration
Registers 1, 2, 4, 5, 6, 8 & 11 contain the value of the single parameter specified, the
remaining registers contain composite parameters. Attempts to write a data value out
of range for these parameters will result in the Illegal Data Value response (Exception
Code 3). Unused bits are set to 0.
Register
Function
Access Type
Hex address
Scaling
1
Analogue output current
Read
00
0mA =0x8000
20mA =0xFFFE
2
Sensor response at calibration
in % of reference
Read
01
0% =0x8000
1000% =0xFFFE
3
Alarm, fault and analogue
output status
Read
02
NA
4
Calibration level setup
Read
03
0 =0x8000
100 =0xFFFE
5
A1 alarm trip level setup
Read/write
04
0 =0x8000
100 =0xFFFE
6
A2 alarm trip level setup
Read/write
05
0 =0x8000
100 =0xFFFE
7
Open collector outputs and
analogue output current at
calibration setup
Read/write
06
NA
8
Number of successful
calibrations
Read/write
07
0 =0x0000
65535 =0xFFFF
9
Modbus setup
Read/write
08
NA
10
Clear latched alarms and faults
Write
09
NA
11
Sensor response at calibration
reference in mV
Read
10
0V =0x8000
10V =0xFFFE
8.5.1 Register 3
A bit value of 1 denotes that the corresponding element is active. A bit
value of 0 denotes that the corresponding element is inactive. All of the 16
bits in the register are simultaneously accessed during a read.
Description
Alarm/Fault Type
Bit Position
A2 Alarm
Latching/Non-latching
15
A1 Alarm
Latching/Non-latching
14
Analogue output at cal level
-
13
-
-
12
-
-
11
-
-
10
F09 calibration (check) time-out
Latching
9
F08 Negative drift > 9.5% LEL
Non-latching
8
F07 EEPROM CRC error
Latching
7
F06 Power low
Non-latching
6
F05 Sensor short circuit
Non-latching
5
F04 Sensor open circuit
Non-latching
4
F03 Low response
Latching
3
F02 Fail to calibrate
Latching
2
F01 Analogue output open circuit
Non-latching
1
-
-
0