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SECTION 4 MODBUS
MODBUS ADDRESS INFORMATION
MB = Modbus Poll Read Discrete inputs (10001....20000)
MI = Modbus Poll Read Holding (4001...50000)
Read:
Instantaneous opacity
Average opacity %
Instantaneous O.D. Display
Instantaneous Mg
Window dust
OPLR Calculated
Opacity Last
Read; Common fault individual blocks:
Mg High alarm
Opacity high alarm
Opacity Early warning alarm
Mg Early warning alarm
In maintenance
SM Power status
T2 Signal lost/low
Negative opacity
Zero Cal Fail
Span Cal Fail
No Air flow (Modbus only)
Zero DAS and/or In Cal
Write:
Remote Cal. Initiate
Address: Example:
MI 230 181 = 18.1%
MI 231 182 = 18.2%
MI 232 (0-2.0)
MI 233 (0-2000)
MI 234 0-10%
MI 245 OPLR
MI 246 For process control. In cal last value going in is held
MB 235 Zero, not cal = 0, in cal =0
MB 236 Zero, not cal = 0, in cal =1
MB 239 No alarm =0. Alarm =1
MB 240 Span, not cal = 0, in cal =1
MB 241 In Maint. =0, Not In Maint. =1
MB 242 Lost power to SM=0, Power OK =1
MB 243 Signal OK =0, Lost signal =1
MB 244 Positive opacity =0, Negative Opacity =1
MB 245 Fail =1, Not fail =0
MB 246 Fail =1, Not fail =0
MB 247 OK =0, Not OK =1
MB 248 Off = 0, On = 1
MB 249 Initiate cal =1
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