Hach 1950Plus, Instrument Manual, Page: 83 / 188

Section 5
Page 83
UVTOCSetup and System Configuration.fm
Setup Menu
Register assignment for ModBus is in compliance with the required network
specification. More information about the ModBus Protocol can be found on
the Schneider Automation website at www.modicon.com. The Modicon
ModBus Protocol Reference Guide can also be ordered from Modicon using
part number PI-MBUS-300.
5.2.8 Tolerances Screen
The Tolerance menu allows setting up of analog quantities, which largely
determine analyzer performance. It is recommended that they not be changed
from their factory settings.
5.2.8.1 Zero Tolerance Screen
Zero tolerance is acceptable CO
2
ppm variation (+/-) allowable when an
autocalibration zero operation is being performed.
Press the Up button while in the Zero tolerances screen. The Span tolerance
screen is displayed.
Table 12 Modbus Registers
Register address Function
40001/2 Live output in mg/L, single precision IEEE float
40003/4 Gas PPM output, single precision IEEE float
40005/6 Gas PPM slope in ppm/min, single precision IEEE float
40007 Reactor temperature in degrees Celsius, integer
40008 Reactor pressure in Kilo-Pascals, integer
40009 Currently selected stream, integer
40010 Machine status, integer
40011 Measurement sync counter (modulo 256), integer
40012 Epa status result, boolean
40013 RTC register 1, Year, YYYY
40014 RTC register 2, Month/day MMDD
40015 RTC register 3, Hour/minute HHMM
40016 RTC register 4, Seconds xxSS
40017 Retention time in minutes, integer
40018/19 Removal percent, single precision IEEE float
40020/21 Alkalinity setpoint, single precision IEEE float
40022/23 EPA TOC output 1, single precision IEEE float
T o l e r a n c e s
Z e r o t o l e r a n c e
5 p p m