Basler Electric BE1-851 - Manual (Page 60)

When the setting group control function block is enabled for Discrete Inputs, there is a direct
correspondence between each discrete logic input and the setting group that will be selected. That is,
when input D0 is asserted, SG0 will be selected, and when input D1 is asserted SG1 will be selected, etc.
The active setting group latches in after the input is read so they can be pulsed. It is not necessary that
the input be maintained. If one or more inputs are asserted at the same time, the numerically higher
setting group will be the active one. A pulse must be present for approximately one second for the setting
group change to occur. After a setting group change occurs, no setting group change can occur within
two times the SGC alarm-on time. Any pulses to the inputs will be ignored during that period.
Figure 4-3 shows an example of how the inputs are read when the setting group control function block is
enabled for Discrete Inputs. Note that a pulse on the D3 input while D0 was also active does not cause a
setting group change to SG3 because the AUTO input is active.
Figure 4-3. Input Control Discrete Inputs
When the setting group control function block is enabled for Binary Inputs, the inputs on D0 and D1 are
read as binary encoded as shown in Table 4-2. Inputs D2 and D3 are ignored. A new coded input must
be stable for approximately 1 second for the setting group change to occur. After a setting group change
occurs, no setting group change can occur within two times the SGC alarm on time.
Table 4-2. Setting Group Binary Codes
Binary Code
Decimal Equivalent Setting Group
D1 D0
0 0 0 SG0
0 1 1 SG1
1 0 2 SG2
1 1 3 SG3
When using control mode 2, the active setting group is controlled by a binary signal applied to the discrete
inputs D0-D1. This requires separate logic equations for only D0 and D1 if all setting groups are to be
used. Figure 4-4 shows how the active setting group follows the binary sum of the D0 and D1 inputs
except when blocked by the AUTO input. Note that a pulse on the D1 input while D0 was also active does
not cause a setting group change to SG3 because the AUTO input is active.
Figure 4-4 shows an example of how the inputs are read when the setting group control function block is
enabled for Binary Inputs. Note that a pulse on the D1 input while D0 was also active does not cause a
setting group change to SG3 because the Auto input is active.
4-4 BE1-851 Protection and Control 9289900990 Rev R