100/180 mm PAPERLESS GRAPHIC RECORDER: USER GUIDE
User Guide
Page 175
HA028910
Issue 13 Sep 16
4.3.18 Demand Writes
DEMAND WRITE CONFIGURATION
Demand writes allow slave values to be written from the master by operator action (from the confi gura-
tion page), by job action, or (if the Screen Builder option is fi tted -
section 7
) by operation of a suitably
confi gured Operator key. Figure 4.3.18a shows a typical confi guration page. Modbus codes 6 and 16 can
be selected for this purpose - see
section 8.2.1
for code defi nitions.
Figure 4.3.18a shows a typical confi guration page for writing to a recorder. Figure 4.3.18b shows the Edit
Constant page. Figure 4.3.18c shows a confi guration page for the case where the destination is defi ned
as a register location.
WRITING TO A KNOWN DEVICE
Figure 4.3.18a shows the confi guration page for writing a value from the master unit to a ‘known’ slave
unit.
Figure 4.3.18a Typical Demand write confi guration page
Enable
Demand Type
Status
Master Comms
Apply
Discard
Write number
1) Write_1
Select the Write num-
ber to be configured
Select 'Master
Comms' or 'Off'
OK
Demand Write
Slave
1) Furn 1 Recorder
Select destination
slave
Parameter
Alarm setpoint 2
Select parameter
to be written-to
Point Type
Channel
Select destination
Point Number
1
Descriptor
Write 1
Source
Constant
Enter default value
Default
0
Allow Constant Edits
Disable Retries
Send On Power Up
On Error Write Default
Allows user to edit the constant prior
to write (if Source = 'constant')
If enabled, the default value is written, should
the selected source be in an 'Error' state.
If enabled, the write is attempted only once.
Write is triggered when the unit powers up.
