Watson-Marlow MM440 - Manual (Page 146)

3 Functions Issue 10/06
MICROMASTER 440 Operating Instructions
146 6SE6400-5AW00-0BP0
NOTE
¾
A communications (CB) module as well as a programming / operator unit can
be simultaneously connected to the COM link interface via terminals 29/30
(USS). This is the reason that the communications module has priority over
USS. In this case, the USS node (USS station) via the COM link is de-activated.
¾ Contrary to PROFIBUS, the RS485 port (terminals 29/30) is not optically isolated
(not floating). When installing the system, it must be ensured that EMC faults do
not result in communication failures or damage to the RS485 drivers.
3.7.1 Universal serial interface (USS)
Parameter range: P2009 – r2037
Significance COM link BOP link
USS basic setting
USS baud rate P2010[0] P2010[1]
USS address P2011[0] P2011[1]
USS-PZD length P2012[0] P2012[1]
USS-PKW length P2013[0] P2013[1]
PZD data
Received data r2018[8] r2015[8]
Received control word 1 r2036 r2032
Received control word 2 r2037 r2033
Sent data P2019[8] P2016[8]
Sent status word 1 r0052 r0052
Sent status word 2 r0053 r0053
Alarms: ---
Faults: F0071,
F0072
Function chart number: FP2500, FP2510, FP2600, FP2610
Features:
− electrical features: Not electrically isolated USS at the BOP link with PC-
converter connecting set
Not electrically isolated USS at COM link
(terminals 29 /30)
− cycle time (MM440): 8 ms (process data PZD)
Background (parameter ID value PKW)