Specifications
AS-Interface
Network transitions
DP/AS-i F-Link
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Benefits
• Gaps in (bus-based) safety technology closed: safety-
oriented signals (EMERGENCY-STOP, door tumbler, light
curtains etc.) collected with AS-i and transferred to higher-
level F-PLC. This enables:
- Quick installation, easy commissioning: Use of AS-i virtues in
the field now fully consistent for Safety Integrated
- Cost-effective solution as ASIsafe is ideally suited for the
collection of "fewer but more distributed failsafe bits".
• Price advantage: As a fully fledged AS-i master according to
Specification V3.0, more input and outputs can be used,
e. g.:
- up to 248 DI / 248 DO when using 62 A/B slaves with
4DI/4DO each
- up to 62 digital or analog slaves
• Investment protection:
- Connection to PROFIBUS networks, such as DP/AS-i Link
Advanced or DP/AS-Interface Link 20E
- Downward compatibility to AS-Interface specification V2
- Open for modern automation concepts with AS-i
• Teaching the code sequences of ASIsafe slaves is possible at
the press of a button
• Reduced amount of engineering work thanks to user-friendly
configuration of all AS-i slaves from Siemens using the slave
selection dialog in HW-Config (STEP 7), including setting the
F-parameter of the ASIsafe slaves modeled on PROFIsafe
slaves
• Cost-savings thanks to programming of the safety logic with
the familiar, powerful commands of the distributed safety
packages from the failsafe SIMATIC PLC in F-FUP or F-FOP,
incl. TÜV-certified function blocks for typical safety applica-
tions
• Use in machine-tools under SINUMERIK 840 D (pI/sl) possible
• Reduction of standstill and servicing times in the event of a
slave failure thanks to user-friendly diagnostics using the
display and through simple module exchange (only a few
settings by control keys are required, without use of the
configuring tool)
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Application
Links between PROFIsafe and ASIsafe
The DP/AS-i F-Link is a PROFIBUS DP-V1 slave (according to
IEC 61508/ IEC 61784) and an AS-Interface master (based on
AS-Interface Specification V3.0 according to IEC 62026-2). It
enables transparent data access to AS-Interface from
PROFIBUS DP. The DP/AS-i F-Link is also the only AS-i master
with which safety-oriented input data can be passed from
ASIsafe slaves via the PROFIsafe protocol to a failsafe CPU with
PROFIBUS DP master. No additional safety cabling or monitor-
ing is required (in particular no AS-Interface safety monitor). The
transmission of binary values or analog values is possible de-
pending on the slave type. All slaves according to AS-Interface
Specification V2.0, V2.1 or V3.0 can be used as AS-i slaves.
PROFIBUS DP masters according to DP-V0 or DP-V1 can
exchange I/O data with lower-level AS-i slaves in cyclic mode.
PROFIBUS DP masters with acyclic services according to DP-V1
are able in addition to initiate AS-i command calls (e. g. read-
ing/writing the AS-i configuration during normal operation). In
addition to digital I/O data, analog data can also be saved per-
formantly in the cyclic periphery of a failsafe S7-300/
S7-416 F-CPU.
In configuring mode the DP/AS-i F-Link reads in the configura-
tion data of the peripherals on the AS-Interface. Slave addresses
can be set using the display and the control keys, and the code
sequences of safe AS-i slaves can be taught.
During operation, four display LEDs and the display provide
detailed diagnostics information, which directly localizes the
fault if required. Using the PLC user program it is possible
to read out diagnostics data records and make them available to
a higher-level operating and monitoring system (e. g. WinCC
Flexible or TRANSLINE HMI).
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© Siemens AG 2011