Device functions
Version 2
RES-5011
Page 25
this state and no measuring impulses are generated. As a result of this, the actual value is no longer updated. The
reset request is not accepted until the RS bit is reset. EtherNet/IP
TM
communications are not interrupted by a con-
troller reset.
The controller actual value output changes to 0…3 °C (i.e. approximately 0 VDC) and the SA bit is set in order to
set the RS bit.
The AUTOCAL function is not canceled if the RS bit is set while it is executing.
The controller performs an internal initialization lasting approximately 500 ms after the RS bit is reset. The next
heatsealing process cannot be started until it has finished.
If a Kb contactor is used to deactivate the control loop (
section 6.3 "Power supply" on page 10), it must be reli-
ably energized again 200 ms at the latest after the RS bit is reset (note the contactor switching and delay times).
If it is energized too late, an error message appears on the controller.
8.5.4
Measurement pause (MP)
No more measuring impulses are generated by the controller as soon as the MP bit is set. Until it is reset again,
only error codes 5 and 7 (201…203, 901, 913) are evaluated and output by the error diagnosis function. In addi-
tion, the actual value is no longer updated. The last valid value before the MP bit was set is output. As soon as the
MP bit is reset, new measuring impulses are generated, all error messages are evaluated, and the actual value is
updated again.
The MP bit is only active in measurement mode. The bits ST, RS, and AC take priority.
The bit is suitable for all applications in which the electrical connections of the heatsealing band must be discon-
nected during normal operation without triggering a fault (e.g. sliding rail contacts).
Unlike the RS bit (RESET), the MP bit does not reset any faults when it is set. The controller is active again as
soon as the MP bit is reset, in other words there is no initialization phase.
When the controller is switched on, it does not evaluate the MP bit until the system test (including the functional
test of the heating circuit) has been successfully completed. This can take several hundred milliseconds.
8.5.5
Master AUTOCAL (MA)
Setting this control bit starts a calibration as described in section 8.5.1 "Automatic zero calibration AUTOCAL
(AC)" on page 23. However, if the Master AUTOCAL function is successful, the heatsealing band resistance which
is determined by the controller is also used as a reference value, e.g. after replacing the heatsealing band.
This reference value serves to calculate the deviation from the calibration value for all subsequent calibrations (ini-
tiated with the AC bit). This deviation helps you assess aging of the heatsealing band.
The deviation from the calibration value is queried by means of the parameter object.
8.5.6
Channel selection (CH0…CH2)
The temperature controller has separate memories for up to eight calibration data records. A calibration data
record contains the values determined by the temperature controller during the AUTOCAL function. By storing the
calibration data records, you can alternate between different sealing tools without having to run the AUTOCAL
function every time the tool is changed. You only need to execute AUTOCAL if you connect a new heatsealing
band.
Since different calibration values, AUTOCAL temperatures, and temperature coefficients are stored in the con-
troller for this purpose, the required calibration data record 0…7 can be selected with the three bits CH0…CH2.
You can switch to another channel at any time.
This function is useful, for instance, in applications where frequent changes of format are necessary. The tools
can then be changed as required in order to handle the different formats. A channel containing the relevant cali-
bration data record is assigned to each tool. Once all tools have been calibrated with a unique channel assign-
ment, they can be changed at any time simply by selecting the appropriate channel.
If the application does not require any format changes, the channel can remain set to 0. In this case, the tempera-
ture controller behaves in exactly the same way as older models where different calibration data records are not
supported.