Bentrup TC 2010 Bedienungsanleitung Seite 32

Table 3: digital output
Digital outputs are used to switch any kind of ON/OFF devices as well as motorized
valves (using 2 digital outputs in sequence). Depending on controller hardware the
output is either a switching relay output (8A / 250V) or a logic output (OFF=0V /
ON=12V). The following parameters select the kind of operation (control outputs,
alarms, events etc.). Digital outputs used by the PLC must not be assigned in this
section
.
00: output mode
Selects an operation mode of the digital outputs:
PRZ: Used to drive a digital output (ON/OFF) according to the value requested by a
control loop, ie. converts a loop output value to pulse width modulation (PWM).
Used to control the heating contactor for instance
MOT: Used to drive a servomotor by the the control loop output. Two digital
outputs (OPEN and CLOSE) are assigned (digial output for CLOSE is assigned to the
following output number automatically). The control value is converted into OPEN
resp. CLOSED pulses according to travel time etc.
LIM: Output works as limit signal (also called alarm output). Any kind of
comparison of process values versus or constant values can be done
PRC: Indication of selectable process conditions. Can be used to activate an output
on programme end, process errors, process holds etc.
EVE: Used to configure the output as program event. Can be programmed to ON or
OFF for each segment. During program run the output is set accordingly
01: destination
Selects the physical output of the signal
following parameters apply on selection PRZ only:
02: loop source
Selects the control loop used to drive the output
operating instructions bentrup TC20xx V1.9
(options END, PRZ, MOT, LIM,
PRC, EVE)
(value range OFF, DO0 to DO6)
(value range LP00 to LP01)
03: output charact
Specifies the operation range of the output. Used to assign an output to either
heating range, cooling range or both rances. Typically the heating output is set to
"0 to +100%" and the cooling output (eg. for controlling a fan) is set to "0 to
100%". Both outputs assigned to the same control loop. The available settings are
0=0% to +100% / 1=+100% to 0% / 2=0% to 100% / 3= 100% to 0% / 4= 100% to
+100% / 5=+100% to 100%
04: outp.% on IDLE
Whenever the controller is IDLE the output provides this value
05: outp. % on ERR
Whenever the controller is in ERROR status the output provides this value. Note
that this only applies on system errors and not an operation error on a single loop
06: min. output %
Lower output signal limit. The output is limited to the given value. Can be used to
obtain permanent minimum heating. Care should be taken since high settings
might interfere with the control loop
07: max. output %
Upper output signal limit. The output is limited to the given value. Can be used to
limit the maximum heating of a kiln. Note that limiting can cause problems if the
applications lacks of heating power (gradient check errors etc.)
08: cyclus time
Cyclus time (in seconds) of the digital output. The output value is converted into an
ON and OFF period accordingly (T on + T off = T cyclus). Decreasing the cyclus time
improves accuracy but might decrease lifetime of the heating device. A typical
value for contactors on kilns is 30
following parameters apply on selection MOT only:
12: channel source
Selects the control loop used to drive the output
(value range 0 to 5)
(value range 0 to 100)
(value range 0 to 100)
(value range 0 to 100)
(value range 0 to 100)
(value range 0 to 100)
(value range LP00 to LP01)
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