West Control Solutions KS 800 CANopen Interface Manual - Manual (Page 36)

KS 800 CAN-Interface
9 Configuration and parameter setting via the CAN bus
The following versions are of importance only in case of KS 800 configuration and parameter
setting via the CAN bus. Normally, the engineering tool is used for this purpose, whereby mutual
configuration data checking and correct order of data during download are already taken into
account.
The order in which the data must be sent to KS 800 for correct configuration and parameter
setting is specified in the list given below. This ensures that values which affect each other
mutually get a suitable content, e.g. a change of the sensor type resets the setpoint limits W0
and W100 to the default values (physical measurement limits of the relevant sensor type). By
setting set-point limits W0 = 50
°
C and W100 = 350
°
C first followed by determination of thermo-
couple type K, the set-point limits would be reset to W0 = 0
°
C and W100 = 1350
°
C.
Moreover, note that a defined order of transmission must be met with parameters par_w0 and
par_w100, or par_ymin and par_ymax., because these two value pairs are checked for plausibili-
ty. The higher value must always be sent first.
If values are set to par_w0 = 100
°
C and par_w100 = 150
°
C (set-point adjustment limit between
100 and 150
°
C) and must be changed into par_w0 = 160
°
C, or par_w100 = 200
°
C, the data
cannot be sent in the order specified below (par_w0 at first followed by par_w100), because the
new lower set-point limit of 160
°
C is higher than the old upper limit (150
°
C). In this case, in-
crease the new upper limit (par_w100) to 200
°
C first and change the lower limit to the new value
subsequently.
9.1 Configuring KS 800 via CAN bus interface:
The specifications described in paragraphs 9.1 to 9.3 need not be taken into account when using
the engineering tool, because they are taken into account automatically, or in the menus.
1. Switch the instrument to off-line
2. Send the configuration data (in correct order)
3. Switch the instrument to on-line (the channels operate with the old parameter values)
4. Send parameter data (they are taken over during operation)
9.1.1 Saving the non-volatile set-point
Two set-point saving methods can be used by KS 800:
1: The volatile set-point is saved in RAM. The controller uses the value saved in this memory
during normal control operation.
2: The non-volatile set-point is saved in EEPROM. This set-point is used as "start set-point" after
initialization (power on, or new configuration) by the controllers. It is copied into the RAM and
used as "working" set-point, until the RAM set-point is overwritten by a PLC.
When changing the non-volatile set-point (EEPROM) in the course of reconfiguration, writing into
EEPROM (saving) is done only "at the relevant controller’s turn". This can take max. 2
instrument cycles (~1,2s). During the time from the end of writing into RAM until restarting the
instrument, the RAM data are used. Before saving the data in EEPROM, the instrument must not
be switched to "on-line", because some new data may be still unsaved in EEPROM, i.e. the old
(set-) values are used again after reinitialization, or after restart.
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