EUCHNER ZSxxxAS1 - Handbuch (Seite 3)

Operating Instructions Enabling Switch ZS...AS
1
Correct use
The EUCHNER enabling switch ZS...AS1 is operated
as a slave on the safety bus
AS-Interface Safety at
Work. The enabling switch is a manually operated
command switch, which allows work to be carried
out in the danger area of automated production
systems in the manual operating mode. Special
technical regulations apply to this operating mode;
these rules are defined in the Machinery directive and
in various European standards.
For application and use according to UL requirements,
an isolating transformer or power supply with max.
secondary overcurrent of 3 A is to be used.
Important:
The user is responsible for the integration of the
device in a safe overall system. For this purpose
the overall system must be validated, e.g. in
accordance with EN ISO 13849-2.
If the simplified method according to section 6.3
EN ISO 13849-1:2008 is used for validation, the
Performance Level (PL) may be reduced if several
devices are connected one after the other.
The enabling switch user must assess and
document remaining risks.
If a product data sheet is included with the product,
the information on the data sheet applies in case of
discrepancies with the operating instructions.
Incorrect use
The enabling signal must not be simulated by fixing
the switching contact in stage 2.
Safety precautions
Enabling switches fulfill a personal protection
function. Incorrect use or tampering can lead to
severe injuries to personnel.
All the safety and accident prevention regulations
for the specific application, e.g. guidelines of
the employers liability insurance associations,
safety requirements of the VDI (EN ISO 10218-1,
VDI 2854), EN 60204, EN 12100,
EN ISO 13849, EN 61062, DIN VDE 0106 part
100, etc., must be observed.
No commands for potentially hazardous
conditions are allowed to be initiated with
enabling switches alone.
The safety function of enabling switches must
not be bypassed (bridging of contacts),
manipulated or otherwise rendered ineffective.
The enabling switch must be protected against
attempts by the operator to bypass its function.
Enabling switches may be used only by
authorized persons who can recognize hazards
in time and who are able to take appropriate
action immediately.
Every person present in the danger area must
carry his/her own enabling switch on his/her
person.
A complete safety-oriented system generally
consists of several signaling devices, sensors,
evaluation units and concepts for safe shutdown.
The manufacturer of a machine or installation is
responsible for correct and safe overall function.
All safety instructions and requirements stated
in the Operating Instructions of the AS-Interface
safety monitor used must be observed.
Mounting, electrical connection and setup only
by authorized personnel.
Function
Function on the AS-Interface bus
The EUCHNER enabling switch ZS...AS1 features a
slave connection to the safety bus
AS-Interface Safety
at Work. It allows work to be carried out in the danger
area of automated production systems in the manual
operating mode.
The switching element of the enabling switch has two
NO contacts (E1, E2).
When the enabling switch is operated, each ZS...AS1
transmits a switch-specific, unique safety code
sequence comprising 8x4 bits over the AS-Interface
bus. This code sequence is evaluated by an AS-Inter-
face safety monitor. NO contact E1 is represented
via the AS-Interface input bits D0 and D1, and NO
contact E2 via the AS-Interface input bits D2 and D3.
The enabling switch must be correspondingly
configured in the AS-Interface safety monitor (refer
to the operating instructions of the AS-Interface safety
monitor used).
Enabling switch ZSB...AS1 additionally features plus
and minus buttons. These buttons are represented
by parameter bits P0 (plus button) and P1 (minus
button). They can be polled by the master once per
cycle (parameter write).
The two buttons can be configured individually. For
example for moving axes in the positive or negative
direction.
Functions of the enabling switch
Stage 1: Off function, pushbutton not pressed
Stage 2: Enabling function, pushbutton pressed to
center position (actuating point)
Stage 3: Off function, pushbutton pushed to end
stop
The enabling function is cancelled by releasing the
pushbutton or pressing it beyond the actuating point.
The enabling function does not reactivate when
returning from stage 3 to stage 1.
Mounting
A suitable holder must be used for the ZS...AS1
enabling switch, e.g. the EUCHNER holder order no.
052406.
Electrical connection
In the installation of a system, the cables and
wires used (except earth conductors) that can
be touched without opening or removing a cover,
or are laid on conductive parts external to the
device, must be either double insulated or have
reinforced insulation between core and surface,
or be surrounded by a metal sheath of adequate
current-carrying capacity in case of a short
between core and sheath.
Hazards due to crushing or cutting of the connection
cable must be prevented by laying the cable
appropriately, e.g. in a protective sleeve.
The safety switch is connected to the bus system
with a 4-core connecting cable with M12 plug
connector via a passive AS-Interface distribution box
with a yellow AS-Interface cable.
Fig. 2: Terminal assignment M12 plug connector
Setup
The enabling switch is logically integrated in the safety
function in the AS-Interface safety monitor configura-
tion. The
Dual-channel dependent module is used for
this purpose.
The
Dual-channel independent module can also be
used after an appropriate risk assessment. Max.
category 1 according to EN ISO 13849-1 can be
achieved with this module. Fault detection is not
possible in this case.
Setting the AS-Interface address
The AS-Interface address of the safety switch is set
using an AS-Interface programming device. Addresses
1 to 31 are valid.
The unit is programmed by connecting the program-
ming device to the M12 plug connector on the
enabling switch with a programming cable.
The default setting for the address on delivery is 0.
Configuration in the AS-Interface safety monitor
(refer to the operating instructions for the AS-
Interface safety monitor)
The enabling switch is configured in the AS-Interface
safety monitor with the AS-Interface address set as
follows, for example:
Dual-channel dependent
Synchronization time: typ. 3 s
It may be necessary to set the synchronization time
to higher values. This depends on the application and
the actuating speed of the enabling switch.
With or without start-up test (corresponding to
risk analysis)
In the operating mode with start-up test, it is necessary
to operate the enabling switch to perform the start-
up test prior to restarting.
1 AS-Interface +
2 Not used
3 AS-Interface -
4 Not used
View of plug connector
Enabling switch
4 3
1 2
0 2 4 6
10
20
30
40
0
a
b
1 3 2
a
b
E1
E1
E2
E2
NO 2 NO 1
E1
D0, D1
E2
D2,D3
3 2 1 Switching
element
Switching
function
Travel diagram
Actuating point
Actuating point
Stage
Operation of the switch without protective cap. The actuating force
with protective cap is dependent on the ambient temperature.
Actuating travel [mm]
Actuating for
ce [N]
Figure 1: Function of the switching element
Contacts open
Contacts closed