On a single-channel input with test pulses, which was previously in the low state,
a shor
t-circuit to high may be interpreted as a pulse by the logic due to the fault
detection. The short-circuit to High causes the signal to switch to High and then back
to Low at the end of the fault detection time. As a result, single-channel signals with
test pulses require particular attention:
•
If a short-circuit to High occurs on a single-channel input with test pulses and this
was already in the High state, the logic interprets this signal as a delayed falling
signal edge (High–Low).
•
If a dangerous state could potentially arise because of an unexpected pulse or a
delayed falling signal edge (High–Low) on a single-channel input, then concrete
measures must be implemented.
This is particularly important in the case of the following inputs:
°
Reset input on the reset function block
°
Restart input on the restart function block
°
Restart input on the function blocks for press applications
°
Override input on the muting function blocks
°
Reset input on a valve monitoring function block
°
Reset to zero input and Set to start value on an event counter function block
Test outputs
WARNING
Ine
ffectiveness of the protective device due to incorrect connection of test outputs
The target safety-related level may not be achieved in the event of non-compliance.
►
For each device to be tested, use a test output of the same module to which the
device is connected.
►
For devices connected to an odd-numbered input (I1, I3, I5, I7) use an odd-num‐
bered test output (X1, X3, X5, X7, XY1). For devices connected to an even-num‐
bered input (I12, I4, I6, I8) use an even-numbered test output (X2, X4, X6, X8,
XY2).
►
Observe the notes on using test pulses in the corresponding chapters of these
operating instructions ("FX3-XTIO I/O module", page 24, "FX3-XTDI I/O module",
page 28 and "FX3-XTDS I/O module", page 30).
5.4.1 Safety command devices and electro-mechanical safety switches
5.4.1.1 Emergency stop pushbutton (e.g., ES21)
Table 49: Connection for emergency stop pushbutton
Electrical connection: example with FX3-XTIO
Single-channel, at 24 V Contact between 24 V and I1
Single-channel, at test output Contact between X2 and I2
Dual-channel, at 24 V Channel 1: contact between 24 V and I3
Channe
l 2: contact between 24 V and I4
Dual-channel, at test output Channel 1: contact between X1 and I5
Channe
l 2: contact between X2 and I6
The dual-channel emergency stop pushbuttons preconfigured in the configuration soft‐
w
are have equivalent switching contacts. You will find suitable elements among the
volt-free contacts for the implementation of dual-channel complementary switching
contacts.
Table 50: Functions with ES21
Function Notes
Tested Possible
5 ELECTRICAL INSTALLATION
78
O P E R A T I N G I N S T R U C T I O N S | Flexi Soft Modular Safety Controller 8012478/1IG6/2023-02-24 | SICK
Subject to change without notice
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