Yokogawa DAQWORX - Manual (Page 33)

3-10 IM WX1-05E
Data Scalng
There are times when the values obtained by reading registers during Modbus
communication are not physical values.
GateMODBUS performs the following calculations on Modbus register values.
X = A • x + B
X: calculated result
x: Modbus register value
A: Coefficient
B: Offset
The user can specify a desired value for coefficient A and offset B above using the
configurator.
Runnng/Stoppng Executable Functon
The configurator starts and stops the executable function. There are two execution
methods, process and service. Process execution starts the application as any normal
program. When started as a process, the executable function closes when logging off
Windows. When started as a service, the executable function is registered in Windows
as an automatically executable service. When started as a service, the executable
function continues processing even when the user has logged off of Windows. Also,
the executable function is run automatically as soon as the PC is turned ON (prior to log
in). However, the function can only be run as a service when using Windows 2000 or
Windows XP by a user with Administrator privileges. Services cannot be executed when
using Windows Vista.
Loop Back Test
Using the configurator, you can perform the Modbus function 08 loop back test on
each Modbus device connected to GateMODBUS. This sub-function is 00, and during
normal operation, data having the same contents as data sent to the Modbus device
by GateMODBUS is returned from the Modbus device. The result of the loop back test
is displayed as either Normal or No Response on the configurator. If the loop back test
results in no response, it may indicate a problem with the communication cable, baud
rate or parity mismatch, or a wrong Modbus address.
Test Acquston
You can perform a test acquisition on each tag using the configurator. For the test
acquisition, data is read from the registers of the Modbus devices specified for each tag,
the results are scaled per specified values and displayed as digital values. From this,
you can determine whether the COM port, Modbus address, Modbus register, scaling
coefficient, and decimal place for each tag is correct.
Montor Server Functon
GateMODBUS takes data read in from the Modbus devices and utilizes its monitor server
functionality to transfer the data to DAQLOGGER or Remote Monitor. The maximum
number of DAQLOGGERs or Remote Monitors that can be connected at once is 16.
Status Dsplay of Executable Functon
The status display function allows you to display the following status items for the
executable function.
• Practice status (stopped, running as a service, running as a process)
• Tags disconnected due to timeout
• PCs connected to DAQLOGGER and Remote Monitor as a monitor server
3.2 Detaled Descrpton of Functons