Servomex 07931001B, Руководство оператора

Страница: 123 / 221

07931001B revision 6 © Servomex Group Limited. 2020
109
Register Name M1
Address
M2
Address
Read/
Write
Notes
set scaling correction
factor 50059 50139 R/W set scaling correction factor for auto val on
measurement 1
Measurement
Concentration 50061 50141 R The current value of validation concentration.
This can be read at any time during auto val
concentration standard
deviation 50063 50143 R The current value of validation concentration
standard deviation. This can be read at any
time during auto val. The std dev is expressed
as a percentage of the current validation
concentration
transmission standard
deviation 50065 50145 R The current value of validation transmission
standard deviation. This can be read at any
time during auto val. The std dev is expressed
as a percentage of the current transmission
zero measurement
scaled to cell length 50067 50147 The zero measurement calculated by the
Laser 3 Plus during auto validation
span measurement
scaled to cell length 50071 50151 The span measurement calculated by the
Laser 3 Plus during auto validation
Final zero threshold 50075 50155 The cell concentration measurement must be
below this level after the final zero flush. If it is
not, then a Maintenance Required fault will be
raised on exiting auto validation. This is to alert
the user that there may be span-gas in the
validation cell and that subsequent measurements
may be incorrect.
Password 50077 50157 Set to operator password to enable auto validation
The password must be entered before each run of
auto val
Modbus Transaction Frequency
Modbus is not a high-speed data interface. Experience with the Laser 3 Plus has
shown that a minimum 100mSec delay should be enforced between successive
Modbus transactions. If attempts are made to read or write Modbus registers any
faster than this it may result in bus errors.
Modbus Addresses That Should Be Monitored Continuously By
The HMI
The Laser 3 Plus does not have the ability to control the gas valves so this
responsibility has to be assumed by the HMI. The Laser 3 Plus uses a set of
Modbus addresses to tell the HMI when to turn the gases on and off.
The registers are
•
Requested zero-gas state
•
Requested span-gas state.
Refer to the Modbus map in section 12.1.14 for the register addresses.