Specifications

AS-Interface
ASIsafe
AS-Interface safety monitors
6/8
Siemens IK PI · 2009
6
■ Overview
Safety monitor in screw terminal version
(removable terminals)
The safety monitor is the centerpiece of ASIsafe Solution local.
It enables safety-orientated responding to signals from the
ASIsafe (input) slaves on the same AS-i network and has 1-2
enabling circuits. A safe application is configured using a PC.
Various application-specific operating modes can be selected
for this. They include, for example, an EMERGENCY STOP
function, door tumbler and selection of stop Category 0 or
Category 1.
To be able to make full use of the AS-Interface diagnostics
options, the monitor can also be operated with an AS interface
address if required. With the help of the diagnostics module for
STEP 7, which is included on the ASIsafe CD, the full diagnostics
spectrum can be processed further in the higher-level PLC.
The AS-Interface safety monitor is currently offered in the latest
Version 3 (Firmware V3.x) and is available in three expansion
levels. Both basic/expanded expansion levels are available
with one or two-channeled configured enabling circuits. The
expanded safety monitor is also available as a version with
integrated safe slave which can be used for the control of a safe
AS-i output or for safe coupling of a switch signal on another
safety monitor or F-Link.
The safety monitor is used in an AS-Interface bus system to
monitor protective devices, e.g. protective doors, EMERGENCY
STOP switches etc.
The safety monitor can be used up to Category 4 acc. to
EN 954-1, to PL e acc. to EN ISO 13849-1 and to SIL 3 acc.
to IEC 61508.
The safety characteristics for the maximum ON period of
12 months and maximum service life of 20 years are:
• PFD: 7.2 x 10
-5
• PFH: 9.1 x 10
-9
The user must calculate the PFD value of the total loop.
Important: Depending on the choice of safety components used,
the complete safety system may also be classified in a lower
safety category.
The safety monitor is mounted on a standard mounting rail.
Disassembly from the standard mounting rail is quick and easy
and requires no tools. With an additional accessory (push-in
lugs), the safety monitor can also be screwed on.
■ Application
The safety monitor acts as a "bus-based safety relay". It provides
a user-friendly introduction to safety-orientated communication
over fieldbuses thanks to its simple configuration using the
graphic PC software asimon.
The standard infrastructure of the AS-i network (AS-i master
under standard PLC, AS-i power supply unit) can still be used
without restriction.
The monitor comes in three expansion levels:
• Basic safety monitor
with starter set of modules and basic functionality
• Expanded safety monitor
with expanded features and functionality
• The expanded safety monitor is also available as a version
with integrated safe slave which can be used for the control of
a distributed safe AS-i output or for safe coupling of a switch
signal on another safety monitor or F-Link.
Basic safety monitor versus –
expanded safety monitor
Number of monitoring modules
The number of devices which the safety monitor can process
is increased with the expanded safety monitor from 32 to 48.
Applications of greater complexity and size can thus be simu-
lated in the safety monitor.
Logic OR operation
At the logic operation level two elements can be linked by OR
operations in the basic version and up to six in the expanded
version.
Logic AND operation
In addition to the standard AND operation in the main path of
an enabling circuit, an AND operation can also be inserted in an
OR operation on the expanded safety monitor. More than two
elements can be linked in this AND.
Basic safety
monitor
Expanded
safety monitor
Number of monitoring modules
32 48
Number of OR gates (inputs)
2 6
Number of AND gates (inputs)
-- 6
Wildcards for monitoring modules
✓ ✓
Deactivating of monitoring modules
✓ ✓
Fault release
✓ ✓
Diagnostics hold
✓ ✓
A/B slaves for acknowledgment
✓ ✓
Safe time functions
-- ✓
"Button" function
-- ✓
Debouncing of contacts
-- ✓
Filtering out of brief disconnections
-- ✓ (as of
Version 3)
Control of safe
AS-i output/safe coupling
-- ✓ (in version
with integrated
safe slave)