Technical data

SED2 Operation & Maintenance Manual Addendum
144 Siemens Building Technologies, Inc.
Using Control and Status Words with BiCo
Many SED2 read-only parameters consist of control words. A parameter control word consists of
a 16-bit number and each bit represents a particular value.
For example parameter r0052 (status word 1) gives value settings such as "Inverter Ready" (bit
0) or "Motor Current Limit" (bit b). Parameter r0052 displays the status of each bit using the
vertical segments of the BOP display.
BiCo can also access these bits using the parameter number and bit state. For example, for a
relay to operate at current limit, parameter P0731 is set to 52.b. (This is a level 2 setting; level 3
can select many more settings using BiCo functions.)
Each bit of the control and status words (r0052 to r0056) can connect to several output functions.
Examples:
Setting P0731 to 56.5 indicates that starting boost is active. If Starting Boost parameter P1312 is
set to enable a starting boost, the relay is active during the ramping phase as the starting boost is
applied.
Similarly, if P0731 is set to 56.6 and P1311 (acceleration boost) is enabled, then the relay is
energized any time that the setpoint is increased.
Setting P0731 to 56.12 enables the relay when the voltage controller is active. As this occurs
during regeneration, it could indicate excessive load or too fast a ramp-down time.