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APPENDIX A-7: MODBUS Register Map Teledyne API - Models T400 and 400E (04402F DCN6340)
A-30
MODBUS
Register Address
(dec., 0-based)
Description Units
10 Sample pressure warning
11 System reset warning
12 Rear board communication warning
13 Relay board communication warning
14 O
3
generator or photometer lamp I
2
C driver chip communication warning
15 Front panel communication warning
16 Analog calibration warning
17 Dynamic zero warning
18 Dynamic span warning
19 Invalid concentration
20 In zero calibration mode
21 In low span calibration mode
22 In span calibration mode
23 In multi-point calibration mode
24 System is OK (same meaning as SYSTEM_OK I/O signal)
25
3
O
3
concentration alarm limit #1 exceeded
26
3
O
3
concentration alarm limit #2 exceeded
MODBUS Coil Registers
(single-bit; read/write)
0 Maps to relay output signal 36 (MB_RELAY_36 in signal I/O list)
1 Maps to relay output signal 37 (MB_RELAY_37 in signal I/O list)
2 Maps to relay output signal 38 (MB_RELAY_38 in signal I/O list)
3 Maps to relay output signal 39 (MB_RELAY_39 in signal I/O list)
20
1
Triggers zero calibration of O
3
range #1 (on enters cal.; off exits cal.)
21
2
Triggers low span calibration of O
3
range #1 (on enters cal.; off exits cal.)
22
1
Triggers span calibration of O
3
range #1 (on enters cal.; off exits cal.)
23
1
Triggers zero calibration of O
3
range #2 (on enters cal.; off exits cal.)
24
2
Triggers low span calibration of O
3
range #2 (on enters cal.; off exits cal.)
25
1
Triggers span calibration of O
3
range #2 (on enters cal.; off exits cal.)
1
Set DYN_ZERO or DYN_SPAN variables to ON to enable calculating new slope or offset. Otherwise a calibration check
is performed.
2
O
3
generator or zero/span valve factory options must be enabled.
3
Concentration alarm option.
4
External analog input option.
06870C DCN6332