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05.03
02.99
n–set operation
STW Control word
ZSW Status word
p
Bit dep. on the program (0 or 1)
s
Traversing task bit of the STW
x
Bit not defined (0 or 1)
Change from 0 to 1 or 1 to 0
Change from 0 to 1 and back again
Change from 1 to 0 and back again
1)
this is only valid if STW.5 = 0
(the speed actual value is kept
constant)
Speed
constant,
i.e. STW.5 = 0
Braking down to zero
speed along a ramp
ZSW =
xxxx xxxx x0x1 1111
i.e. STW.6 = 0
Braking
i.e.
STW.4 = 0
i.e. STW.5 = 1
STW.6 = 1
STW.6 = 0
Inhibit setpoint
i.e. STW.6 = 0
Setpoint enable
i.e. STW.6 = 1
Braking with maximum
acceleration
ZSW =
xxxx xxxx x0x0 1111
Speed
constant,
i.e. STW.5 = 0
Fig. 4-6
Flow diagram "Variable–speed drives" for the n–set mode
E Siemens AG 2013 All Rights Reserved
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
START
Voltage
ON
Not ready to
power–up
ZSW =
x00x x111 x000 x000
Initializing
i.e.
STW = xxxx xxxx x000 1111
Operation enabled
ZSW =
1x0x xxxx x000 1111
Speed setpoint is accepted
Enable
i.e. STW.4/5/6 = 1 (any
setpoint
sequence)
i.e. STW.6 = 1
Setpoint
Ramp–up to the
inhibit
setpoint
ZSW =
xxxx xxxx x111 1111
Speed
Constant speed,
increases,
i.e. STW.5 = 0
Speed actual value is
1)
kept constant
1)
ZSW =
xxxx xxxx x101 1111
Braking
i.e. STW.4 =0
Braking with maximum
acceleration
ZSW =
xxxx xxxx x1x0 1111
Speed
constant,
i.e. STW.5 = 0
4 Communications via PROFIBUS–DP
4.2 Process data (PZD area)
Power–on inhibit
ZSW
OFF 2
x00x x111 x111 0000
i.e. STW.1 = 0
(from each
OFF 1
device status)
i.e.
STW.0 =
OFF 2 active
ZSW =
xxxx xxxx x1x0 x000
No OFF 2
i.e. STW.1 = 1
OFF 3
i.e. STW.2 = 0
(from any
device status)
OFF 3 active
ZSW =
xxxx xxxx x10x x000
No OFF 3
i.e. STW.2 = 1
Fault
(from any
device status)
Braking
i.e.
STW.4 = 0
Fault
ZSW =
xxxx xxxx xxxx 1xxx
Fault resolved,
acknowledge faults
i.e. STW.7 =
4
4-119
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