Siemens MICROMASTER 420 Reference Manual page 66

Table 3-8
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
Bit 9
Bit 10
Bit 11
Bit 12
Bit 13
Bit 14
Bit 15
Using MICROMASTER 420 as a replacement for MM3 on an existing machine,
setting P1820 = 1 (reverse output phase sequence) will allow the inverter to be
operated with the existing control word.
The frequency will be displayed as negative for clockwise rotation (RUN RIGHT) in
this case.
According to USS protocol, the functions of bits 11 to 15 are user defined. This
brings MICROMASTER 420 in line with all future Siemens products.
MM3 parameter P95 "USS Compatibility" setting can be achieved by setting
P2009 = 1 (level 3, see previous section).
3.3.14 Reading and Writing Parameters
This is no longer compatible with previous MICROMASTER products. Apart from
different parameter numbers, many of the parameter values now use IEEE float
format, which necessitates the use double word parameter values and thus
requires a longer PKW part of the telegram. This brings MICROMASTER 420 in
line with other Siemens inverters such as MasterDrive.
3.3.15 Broadcast Mode
MM3 operated with a 3 word PKW only. For this reason the PKW area
requirement for broadcast mode was not implemented and it was actually possible
to change parameter values on all slaves using a broadcast telegram.
58
Comparison Table (MICROMASTER 420/Earlier MICROMASTER)
ON (Ramp-up)/ OFF1 (Ramp-down).
OFF2: electrical stop.
OFF3: Fast stop.
Pulse enable.
Ramp function Generator (RFG) enable.
RFG start.
Setpoint enable
Fault acknowledge.
Jog right.
Jog left.
Control from PLC.
Right direction.
Left direction.
Not used.
Not used.
Not used
Same as MM3.
Same as MM3.
Same as MM3.
Same as MM3.
Same as MM3.
Same as MM3
Same as MM3.
Same as MM3.
Same as MM3.
Same as MM3.
Same as MM3.
Setpoint inversion 0 run right.
1 run left.
Not used.
Not used.
Not used.
Not used.
MICROMASTER 420 Reference Manual
Issue A1