Safety Integrated - Industry - Siemens

Variables of FB "STANDSTILL_AND_SAFETY_V" (FB 2, DB 2):
Formal
parameters
Data Type Explanation
N_PB INT Actual speed value (determined via PROFIBUS). Provided by master CPU in 1/min.
N_COUNT INT Actual speed value (determined via SBM2 module of MASTERDRIVES and count module of the ET 200S). Provided
by OB35 of the F-CPU in 1/min.
DMS BOOL "Dead Man Switch": Button (NO) which can start the drive from standstill when "safe speed" (SG) mode is set.
SG remains active as long as
• the button (NO) stays pressed
• the operating mode "safe speed" (SG) is set
• the emergency stop push button is not pressed
• the plausibility checks of the speed is confirmative
• the readback signal of K2 is pending correctly
ACK BOOL Occurring errors are acknowledged with the acknowledge signal.
REQ_SG BOOL Mode switch
0: normal operation, 1: "safe speed" (SG)
N_MAX INT N_ERR1=1 for N_PB>N_MAX or N_COUNT> N_MAX. In operating mode SG this causes safe shutdown of the drive.
N_SG INT Maximum speed value in 1/min for "safe speed" (SG).
N_SG_TOL INT Tolerance range for N_SG. The drive is safely shut down in "safe speed" (SG) mode if the actual speed value is
larger than N_SG + N_SG_TOL.
N_DIFF INT Determined are
• the actual speed value determined via PROFIBUS and
• the actual speed value determined via the count module of ET 200S.
If the differential value of both determined actual speed values exceeds the parameterized value N_DIFF, this is
interpreted as plausibility error. N_ERR2 then becomes 1 and the drive is safely switched off.
N0_TOL INT When determining the standstill, the drive speed does not become 0, but is compared with the value parameterized
at N0_TOL. This takes into account, that the incremental shaft encoder can also detect speeds not equal to 0
due to small movements of the drive. On average, however, the speeds are 0.
OUT1 BOOL OUT1=1: start command for drive.
DELAY_ON TIME Switch-on delay. After the time has elapsed, the evaluation of the plausibility check becomes active. The delay is
due to the inertia of the mechanical contacts.
SSTILL BOOL 1: drive in standstill
N_ERROR BOOL Collective error: is set to 1, if in "safe speed" (SG) mode one of the following errors occurs.
• the actual speed value exceeds a speed value N_MAX (N_ERR1=1)
• the speed determined via PROFIBUS and the speed determined with the ET 200S count module deviate
(N_ERR2=1).
• The drive is started in the DP master with OUT1=1. If there is a faulty transmission in the address transfer area
then DP Slave OUT1=0 but the drive remains active (SSTILL=0). If this condition is true, then N_ERR3=1.
• The actual speed value exceeds the set speed value for safe speed (N_ERR4=1).
EN_SG BOOL 1: "Safe speed" (SG) is active.
Note
The parameterized count values are sample values and
must be adjusted according to their individual requirements.
Functional Example No. AS-FE-I-012-V10-EN 389
Ex. No.
12