Safety Integrated - Industry - Siemens

Ex. No.
11 Process: Group passivation
What is group passivation?
Group passivation refers to simultaneous passivation of several
G-modules. The following example explains the application
of group passivation:
An end-switch has been connected at an F-DI. The end-switch
is used to monitor the position of an axis. The drive of this axis
is controlled via an F-DO. During wire-break at the end-switch,
the drive must be switched off for safety reasons. This can be
realized via the safety program: During passivation of F-DI, the
entire F-Do is passivated at the same time.
How is a group passivation realized?
In the safety program, individual F-modules can be grouped
together. The characteristic of a group is:
■ If 1 F-module "x" from this group is passivated, then all
other F-groups from this group are passivated.
■ After manual or automatic reintegration of this F-module
"x", the remaining F-modules of the group are automatically
reintegrated.
The PASS_OUT and PASS_ON bits of the respective F-I/O data
blocks (page 349) are used for a group passivation:
Group not passivated (1)
F-DI passivated (2)
Group passivated (3)
F-DI is reintegrated (4)
Group reintegrated (5)
Error at F-DI
Passivating the group
Remove error at F-DI
Reintegrating the group
The number in brackets indicates the state.
362 Functional Example No. AS-FE-I-011-V10-EN
■ All PASS_OUT variables of the F-module of this group must
have a OR logic operation
■ The result of the OR logic operation must be assigned to all
PASS_ON variables of the F-modules of this group
In the following example a group is realized. The group consists
of an F-DI and an F-DO:
■ If the F-DI is passivated, F-DO should also be passivated at
the same time.
■ If the F-DI is reintegrated, F-DO should also be reintegrated
at the same time.
The example shows:
■ What is the process of a group passivation?
■ How do the relevant bits in the F-I/O data block of F-DI and
F-DO behave?
■ What is the design of the respective safety program?
The following figure and table illustrates the process sequence.
The following figure shows the process of a group passivation.
F-DI not passivated
F-DI passivated
F-DI passivated
F-DI not passivated
F-DI not passivated
F-DO not passivated
F-DO not passivated
F-DO passivated
F-DO passivated
F-DO not passivated