bittner XB400 - Configuration Switching Via the Logic Inputs; Special Functions

3 Specifications of the Devices
Page 89
3.14.9 Special Functions
3.14.9.1 Configuration Switching via the Logic Inputs
The configurations of the SXL II may be also re-called via its logic inputs. This provides, for example, external
control without a network connection.
Switching by the logical inputs is globally activated for the SXL II. The appropriate parameter CfgByInput is
located in menu SXLSTAT and should be switched ON.
If the switching should be controlled by a mechanical multi-switch, it is important to note that the contacts
may bounce electrically. This effect is typical for elastic components inside switching mechanisms. As a
result, the SXL II may switch several times between two configurations.
The parameter CfgDelay in the SXLSTAT menu is used to avoid this negative effect. It is accessible in Service
Mode 1 (refer to section 3.14.7.2). It defines how long the control voltages need to be applied until it
is recognized by the SXL II. The delay is set by numbers between 2 and 20. These numbers need to be
multiplied by 100 ms. Consequently the values range from 200 ms to 2 seconds. A value of 5 (= 500 ms)
has proven to be adequate.
Binary Switching
The voltages applied to the first 4 logic inputs are interpreted as a 4-Bit word:
Configuration IN 4 IN 3 IN 2 IN 1
1 0 0 0 1
2 0 0 1 0
3 0 0 1 1
4 0 1 0 0
5 0 1 0 1
6 0 1 1 0
7 0 1 1 1
8 1 0 0 0
9 1 0 0 1
10 1 0 1 0
11 1 0 1 1
12 1 1 0 0
13 1 1 0 1
14 1 1 1 0
15 1 1 1 1
Caution
The bit-word 0000 is not listed as it is being used for a different purpose (see below).
To re-call a configuration, it makes no difference whether the applied bit-word is permanently or momentar-
ily applied. In the latter case the appropriate SXL II configuration will be re-called and then configuration 0,
which always holds a copy of the last re-called configuration (refer to section 3.14.8.6).
Example: To re-call configuration 11, the bit muster 1011 should be applied to the logic inputs. The SXL
II will start configuration 11. The contents of configuration 11 will then be copied to configuration 0.
After disconnecting the control voltages, the SXL II switches to configuration 0 which is now identical to
configuration 11.
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