IDEC WindMSG - Manual (Page 22)

How Do I?
In this Chapter...
Frequently asked questions
6.1 Frequently asked questions
This chapter answers the questions user normally asks.
1. How can I read PLC data?
To read any PLC data, the required tag should be defined in
the Tag Database. In a screen the tag should be embedded
in the required format.
2. Can I edit PLC data? How?
Any PLC register / coil can be edited except for ‘Read only’
registers / coils. Generally System registers and Input coils
are ‘Read only’. ‘Read only’ registers / coils vary from PLC to
PLC. Please refer to PLC manual for details. To edit any PLC
data define the tag in Tag Database. Place a ‘Data Entry’
object in a screen. Make sure to define the required keys.
Register and Coil data entry key definitions are given in
Table 4.1 and Table 4.2.
3. Can I keep a record of the Process data?
HG1X models can send screen data (Alphanumeric data
only) on its serial port. This output can be given to a serial
printer and a record of events can be achieved. A screen with
‘Print Data’ task can print all the alphanumeric objects.
4. Can I change screens using PLC logic?
Any PLC tag can be copied to STR, a system register internal
to HG1X, and HG1X will display the corresponding screen.
User must define the task ‘Copy tag to STR’ in Global
Application Task-List. Make sure to define screens to all the
possible values of the tag to avoid ‘Screen not defined’
message. Please note that the ‘Goto screen’, ‘Goto next
screen’ and ‘Goto previous screen’ tasks will not work in this
case. To change the screen the value of the PLC ta should
be changed.
5. Can I perform any task continuously?
To perform any task continuously define the task in Global
Application Task-List. This task will be performed till the unit
is powered.
6. How can I ‘Hold’ any Bit on or off using a key?
To hold a bit on using a key, define ‘Turn bit on’ task in ‘Key
press task-list’ and ‘Turn bit off’ task in ‘Release key task-list’
for the same key.
7. How do I keep any screen or any key locked?
Any screen or a key can be kept secret using the ‘Password’
feature of HG1X. Password protected screen will not be
displayed till the user enters the correct password. Similarly
task for password protected key will not be performed till user
enters the correct password.
8. Can I assign scaling factor for any tag?
Value of any tag can be converted in to the required format
by performing ‘Math Operations’ on it. This DOES not change
the value of the actual tag. ‘Math Operations’ can be
performed in ‘Display HG1X / PLC Data’ objects. Data to be
written to a tag can also be manipulated by assigning ‘Math
Operations’ in ‘Data Entry’ object.
9. Can I limit the data to be entered in a tag?
Data entered in any register tag can have high and low limits.
This keeps a check on the register limits.
Refer to ‘Configuration software’ section for detailed information on
how to define an application.