100/180 mm PAPERLESS GRAPHIC RECORDER: USER GUIDE
HA028910
Issue 13 Sep 16
User Guide
Page 176
4.3.18 DEMAND WRITES (Cont.)
CONFIGURABLE ITEMS
Write number
Allows the user to select the Demand Write number to be confi gured
Enable
Allows the user to enable/disable the write.
Demand Type
Select ‘Master Comms’ or ‘Off’
Status
Shows the status of the transaction. The meaning of most status strings are self-evi-
dent, the remaining ones have the following defi nitions:
OK:
Transaction was carried out and a satisfactory response has been received
Idle:
Appears only before the fi rst Write following a power cycle, or if the Write
has not previously been confi gured.
Pending: Appears if the Write is waiting to happen, or a response is being waited for.
Can appear, for example, if the Write is queued.
Timeout: Appears if the slave fails to respond within the timeout set in the Master
Comms confi guration page.
Transaction Disabled:
Appears, for example, if the Write has been disabled, but a job is still trying
to trigger it.
Slave
Allows the user to select the Slave to be written-to, from a picklist containing all the
confi gured devices in the Master Comms confi guration page.
Parameter
Select parameter to be written to (picklist varies according to slave type/model)
Point type/Loop Number/Group Number
Allows a point, loop or group number to be entered for the selected parameter.
Descriptor
Allows a descriptor to be entered for the Write.
Source
Allows the source of the Write to be chosen, from a picklist containing ‘Constant’
plus all points in the recorder.
Default
Allows a value to be entered for use as a default to be written to the destination
point. Appears if ‘Source’ = ‘Constant’, or for any other source, if the ‘On Error Write
Default’ checkbox (see below) is enabled.
Allow Constant edits If this is enabled, the user may change the default value before it is sent. Applies
only to user-triggered writes. See ‘Demand Write Button’, below.
On Error Write Default
Appears for all sources other than ‘Constant’. If this function is enabled, then the
default value is written, instead of the source value, should the source be in an Error
state. When enabled, the ‘Default’ entry box appears, if it was previously hidden.
Disable Retries
If enabled, this function causes the recorder to attempt the Write only once, instead of
retrying according to the number of retries set in the Master Comms Confi guration Page.
Send On Power Up If enabled, this causes the default value to be Written at Power-Up.
DEMAND WRITE BUTTON
When operated, this pushbutton causes the Write to be initiated. If the source is ‘Constant’ and the ‘Al-
low Constant Edits’ item is enabled, an ‘Edit’ page appears (fi gure 4.3.18b) allowing the user to change
the constant value from its default value, before the Write is carried out. Otherwise, the Write is carried
out without any further action being required.
Figure 4.3.18b Constant Edit page
Write 1
OK
0
Write now
Close
Status
Constant
