Basler BE1-951 User Manual

4-4 BE1-951 Protection and Control 9328900990 Rev L
Manual (logic) control reads the status of the logic inputs to the setting group control function block to
determine what setting group should be active. For the logic inputs to determine which setting group
should be active, the AUTO input must be logic 0. The function block logic mode setting determines how
it reads these logic inputs. There are three possible logic modes as shown in
Table 4-1.
When the setting group control function block is enabled for Mode 1, there is a direct correspondence
between each discrete logic input and the setting group that will be selected. That is, asserting input D0
selects SG0, asserting input D1 selects SG1, 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 activated. 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 logic is
enabled for Mode 1. Note that a pulse on the D3 input while D0 is also active doesn't cause a setting
group change to SG3 because the AUTO input is active.
D3
D2
D1
D0
AUTO
SG3
SG2
SG1
SG0
SGC
D2647-20
08-21-98
Figure 4-3. Input Control Mode 1
When the setting group control function block is enabled for Mode 2, inputs D0 and D1 are read as binary
encoded (
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
D1 D0
Decimal Equivalent Setting Group
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 discrete
inputs D0 and 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 is also active doesn't
cause a setting change to SG3 because the AUTO input is active.

Basler BE1-951 Specifications

General

Brand	Basler
Model	BE1-951
Category	Surge Protector
Language	English