Timeouts And Other Errors; Uss Process Data Channel (Pzd) - Siemens SINAMICS G120 Operating Instructions Manual

Functions
5.11 Operation in fieldbus systems
5.11.2.3

Timeouts and other errors

Process timeouts
Parameter P2014 defines the permissible timeout in ms. Value zero prevents timeout
monitoring. Parameter P2014 checks the cyclic update of bit 10 in control word 1.
If the USS is configured as a command source for the drive and P2014 is not zero, bit 10 of
the received control word 1 is checked. If the bit is not set, an internal timeout counter is
incremented. If the threshold defined in P2014 is reached, the drive sets a process timeout
error.
Other errors
P2025 = USS rejected
P2026 = USS character frame error
P2027 = USS overflow error
P2028 = USS parity error
P2029 = USS start not recognized
P2030 = USS BCC error
P2031 = USS length error
5.11.2.4

USS process data channel (PZD)

Description
Process data (PZD) is exchanged continuously between the master and slave in this
telegram range. Depending on the direction of transfer, the process data channel contains
request data for the USS slave or response data to the USS master. The request contains
control words and setpoints for the slaves, while the response contains status words and
actual values for the master.
Figure 5-20
160
USS process data channel
CU240S and CU240E Control Units, FW 3.2
Operating Instructions, 03/2009, A5E02440075B AA