Siemens SIMATIC ET 200SP Información sobre el producto - Página 20

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Siemens SIMATIC ET 200SP Información sobre el producto
Connecting
4.1 Additional rules and provisions for operation of the ET 200SP with fail-safe modules
Additional requirements for actuators
The fail-safe output modules test the outputs at regular intervals. The F-module briefly
switches off the activated outputs and, if necessary, switches on the deactivated outputs.
You can assign the maximum duration of the test pulses (dark and light period) with
parameters.
High-speed actuators may briefly drop out or be activated during this test. If your process
does not tolerate this, set the pulse duration of the light or dark test correspondingly or use
actuators that have sufficient lag.
If the actuators switch voltages greater than 24 V DC (e.g., 230 V DC), the outputs of a fail-
safe output module and the parts carrying a higher voltage must be electrically isolated
(according to IEC 60664-1).
This is generally the case for relays and contactors. Particular attention must be paid to this
issue for semiconductor switching devices.
Technical specifications of sensors and actuators
Refer to the manuals of the fail-safe modules for technical specifications to assist you in
selecting sensors and actuators.
4.1.3

Capacitive crosstalk of digital input/output signals

When fail-safe digital output and input signals are in a single cable, F-DQ modules and F-
PM-E modules may experience readback errors.
Cause: Capacitive crosstalk
During the bit pattern test of the outputs or the sensor supply of the inputs, the steep
switching edge of the output drivers caused by the coupling capacitance of the line may
result in crosstalk to other non-activated output or input channels. This may then lead to a
response of the readback circuit in these channels. The module detects a cross circuit/short
circuit and performs a safety-related shutdown.
Remedy:
● Separate cables for F-DI modules, F-DQ modules, and F-PM-E modules or non-fail-safe
DQ modules
● Separate cables for F-DQ channel and F-DI channels for the F-PM-E module
● Coupling relay or diodes in the outputs
● Disable the sensor supply test if safety class requirements allow it
Cause: magnetic crosstalk
Note that an inductive load connected to the F-DQ channels can induce capacitive coupling
of a strong magnetic field.
Remedy:
● Spatially disconnect the inductive loads or shield against the magnetic field.
● Configure the readback time to 50 ms or higher.
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WARNING
ET 200SP distributed I/O system
Product Information, 07/2013, A5E32288220-AA