
Controller functions
RES-409
Page 31
10.3.2 START / STOP command
"START" signal
A "START" command or a "START" signal is
rejected ("HEAT" LED blinks fast) if the
"AUTOCAL" function is running or a "RESET"
command is active.
The fault output is switched if a "START" command (or
the "START" signal) is activated while a warning
message with error codes 8…12 (as of February 2007
also: 104…106, 111…114, 211, 302, 303) is displayed
(
section 10.16 "Error messages" on page 45). The
heatsealing band is no longer heated.
By means of the CAN protocol:
The "Value" parameter in the START command
(address 5) has the following structure:
The START command is only accepted if there are no
faults and the "AUTOCAL" function is not running
(
section 10.4.1 "Controller status" on page 36). The
number of the required set point and the maximum
heatup time (50ms…2550ms) are transferred together
with the START command. If the controller must heat
for longer than 2550ms (e.g. for continuous heating), a
new START command must be sent before the end of
the heatup time. This mechanism ensures that the
controller does not heat in an uncontrolled way for long
periods if there is no CAN communication. The heating
phase can be prematurely terminated by sending a
START command with a heatup time < 5 (corresponds
to < 50ms), whereby the set point number is irrelevant.
The controller then stops the heating phase
immediately and changes to measuring mode.
Each START/STOP command is answered with an
acknowledgment message (address 9), which also
contains the 6 low bits of the controller status in
addition to the actual temperature value.
By means of a 24VDC control signal:
(controllers manufactured as of February 2007)
A START/STOP command for set points 0 and 1 can
also be activated by means of a digital 24VDC control
signal (START 0 or START 1). When a "START" signal
is activated, the controller-internal set/actual
comparison is enabled and the heatsealing band is
heated to the SET temperature. It remains at this
temperature until the signal is deactivated again.
The "HEAT" LED on the front panel of the RES-409 is
lit continuously for the duration of the heating phase.
The "START" signal (START 0) for set point 0 is
activated by applying a 24VDC signal at terminals 5+6.
!
Bit no.
Name
Meaning
Bits 0…7
Heatup time
Time in 10ms steps until the control process is automatically deactivated
(at least 50ms).
Bits 8…9
Set point
Number of the required set point (0…3)
Bits 10…15
Not assigned
RES-409
max. 6mA
5
6
START 0
(set point 0)
+
-
GND
24VDC
START 0
(set point 0)
HIGH:
12VDC
LOW:
2VDC