User manual

28 UR3274U - User manual
t.2.w.e.
Timer  Warning
Expiring
Alarm active for the last ” of Timer
t .1 . 2 . s .
Timer - Start Alarm
Alarm active as long as Timers  and 
are in Start mode (Timers active)
t .1 . 2 . e .
Timer - End Alarm
Alarm active at elapsing of Timers  and
 until any key is pressed. Option not
available for Dual sequential Timer and
Dual Timer Loop.
t .1 . 2 . w .
Timer - Warning
expiring
Alarm active for the last ” of Timers 
and .
 Serial Communication
. Slave
UR3274U6 is equipped with RS485, it can receive and broadcast
data via serial communication using MODBUS RTU protocol. The
device operates as slave if parameter 59
mast. is set as di s. This
function enables the control of multiple devices connected to a
supervisory system (SCADA).
Each controller will answer to a master query only if the query
contains same address as on parameter
sL. a d . The permitted
addresses range from 1 to 254 and there should not be control-
lers with the same address on the same line.
Address 255 can be used by the master to communicate with all
the connected equipment (broadcast mode), while with 0 all
the devices receive the command, but no answer is expected.
UR3274U
can introduce an answer delay (in milliseconds)
to master request. This delay has to be set on parameter 58
se. de.