Technical data

Chapter 4 – BiCo Data Set Functions
Siemens Building Technologies, Inc. 143
4. Run the SED2 using input 1 and operate the value using input 2.
NOTE: BiCo is a ’reverse’ connection. That is, the output function connects back to the
input; it is not possible to tell from P0702 (99) what the digital input is controlling.
However, there are many diagnostic parameters that can assist in setting up BiCo
functions (see Examples 2, 3, and 4).
Example 2:
Set P0771 to 37. This setting connects the analog output to the Inverter Temperature parameter
r0037 so that the temperature of the inverter can be monitored remotely.
Example 3:
1. Using OFF3 instead of OFF1, set P0701 = 99 to enable the BiCo function.
2. Set P0840 = 722.0 (ON right via digital input 1) and P0848 = 722.0 (OFF3 via digital input 1).
The drive now ramps between setpoints using the normal ramp time as set in P1120 and P1121.
However, at switch off from digital input 1, the drive turns off with an OFF3, using the ramp rate
set in P1135, which may be different than P1121.
An additional advantage is that the OFF3 function usually requires a second digital input. The
BiCo function permits digital input 1 to perform a run right and an OFF3.
Example 4:
This example selects an alternate ramp-up time when a certain fixed frequency is selected.
Select three fixed frequencies using three digital inputs. The digital inputs are set for ’ON right’.
The third digital input also sets the alternative (JOG) ramp times.
NOTE: This example only enables an alternative ramp-up time. When digital input 3 switches
low, it also deselects the alternative ramp time and the normal ramp time is used.
1. Use fixed frequencies and set P1000=3.
2. Enable BiCo functionality by setting P0701, P0702, P0703 = 99.
3. Define the source of the fixed frequencies by setting P1020=722.0, P1021=722.1,
P1022=722.2. (This defines the source of each frequency as digital input 1, 2, and 3.)
4. Define the mode of operation by setting P1016, P1017, P1018 = 2. (This sets the mode of
operation of fixed frequencies to ’select fixed frequency and ON right command’.
5. Select JOG ramp times instead of normal ramp times by setting P1124 = 722.2. (This
enables digital input 3 with this function.)
NOTE: To avoid confusion, Steps 3 and 4 use BiCo functions to set digital inputs 1 and 2.
This could also be set using the standard parameterization.