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02.99
06.05
5.5.15
Telegram substitution (from SW 3.0)
Description
For specific applications it is necessary that under no circumstances
(PROFIBUS–DP fails) that the axis of the drive comes undesirably to a
standstill or the drive state can be configured to "freeze" to run–down
the master.
Warning
!
For P701=1, the function is immediately effective. The drive only
evaluates PZD data if STW.10 = 1.
It must be carefully ensured that the drive can always be stopped
using an EMERGENCY SWITCHING–OFF button/function In addition
we recommend that one of the two input terminals should be
parameterized with the "OFF1" function (refer to P31/P32).
The function is available for both operating modes – "positioning" and
"speed setpoint" (P700).
Behavior after
activation
S
(P701 = 1)
S
S
S
S
E Siemens AG 2013 All Rights Reserved
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
PZD data that is available (STW, block selection and start byte) is
only evaluated if the STW.10 "control from PLC requested" is equal
to "1".
If STW.10 changes from "1" to "0", then the currently active drive
state (PZD data being used) is frozen. The drive uses the last re-
ceived STW, block selection and start byte (or speed setpoint)
where STW.10 was 1.
PZD data that is received is only taken into account if STW.10 = 1.
In this case, PZD data must be sent from the same master type as
before the connection was lost. It is not possible to interrupt a con-
nection with a Class 1 master (S7–CPU) and resume communica-
tions with a Class 2 master (PG/SimoCom A) (refer to P928).
If the drive is powered–up (power–on) and P701 = 1 was previously
saved in the FEPROM (refer to P971), then the drive only responds
when PZD data is available, if STW.10 = 1.
If the bus connection to the drive fails, then the currently active drive
state is frozen. The drive uses the last received STW, block selec-
tion and start byte where STW.10 was 1.
After the bus connection has been restored, PZD data that is re-
ceived is only taken into account again if STW.10 = 1. Also in this
case, PZD data must be sent from the same master type as before
the connection was interrupted.
5 Description of the Functions
5.5 SIMODRIVE POSMO A functions
5
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