Procedure - Siemens SINUMERIK 840D sl Function Manual

05.08
7.4.3

Procedure

The brake test in the PLC is carried out by calling function block FB11 (from the
basic program) from the user program. The brake test comprises the following
steps:
Step
Start brake test
Close Brake
Output traversing command
Check, output traversing command
Wait for the holding time
De–select brake test/open brake
Output test ok
Function_Block FB 11
Declaration of the function:
VAR_INPUT
Start : BOOL ;
Quit : BOOL ;
Bclosed : BOOL ;
Axis : INT ;
TimerNo : TIMER ;
TV_BTactiv : S5TIME ;
TV_Bclose : S5TIME ;
TV_FeedCommand : S5TIME ; //TimeValue –> force FeedCommand
TV_FXSreached : S5TIME ;
TV_FXShold : S5TIME ;
END_VAR
VAR_OUTPUT
CloseBrake : BOOL ;
MoveAxis : BOOL ;
Done : BOOL ;
Error : BOOL ;
State : BYTE ;
END_VAR
The following table lists all of the formal parameters of the brake test function:
Signal Type
Start I
Ackn I
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
Expected feedback
DBX 71.0 = 1
Bclosed = 1
DBX 64.6 Or DBX 64.7
DBX62.5 = 1
DBX62.5 = 1
DBX71.0 = 0
//Start of the brake test
//Acknowledge fault
//Brake closed input (single channel – PLC)
//Testing axis No.
//Timer from user
//TimeValue –> brake test active
//TimeValue –> close brake
//TimeValue –> Fixed stop reached
//TimeValue –> test brake
//Signal close brake
//do move axis
//Error byte
Type
BOOL Starts the brake test
BOOL Acknowledge fault
Connecting Sensors/Actuators
7.4 Safe brake test (SBT)
Monitoring time value
TV_BTactiv
TV_Bclose
TV_FeedCommand
TV_FXSreached
TV_FXShold
TV_BTactiv
Comment
7-255