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2.2
System limits
The maximum attainable performance level of the overall system is limited to PL c (ISO 13849-1).
Differences to TMC 66:
• No monitoring of the muting lamp because this function is no longer stipulated in the relevant stan-
dards. This means that a defective muting lamp is not detected by the MSI 420.TMC-03.
• No 7-segment display. Instead, the error display is implemented using three diagnostics outputs (see
chapter 5 "Diagnostics messages").
• The safety outputs of the MSI 420.TMC-03 units are semiconductor outputs with a switching power
of up to 4A. If potential-free outputs are required, a relay must additionally be used.
• No DIP switches for setting the different operating modes. The operating mode is selected via a bit
pattern at the inputs of the MSI 420.TMC-03 (see chapter 4 "Electrical connection and commission-
ing")
2.3
Muting sensors
Throughbeam or retro-reflective photoelectric sensors with activation input (PNP HIGH active) can be
used as muting senders for the MSI 420.TMC-03.
2.4
Protective sensors
The used protective sensor must achieve at least the following characteristic safety values. Type 2 (acc.
to 61496-2), PL c and category 2 (acc. to ISO 13849-1). Furthermore, the information in the manual of the
used protective sensors must also be observed.
2.5
System response time
The response time is the time taken for the safety function to be called.
Example: The time from entry into the protective sensor until shutdown of the machine.
When the safety distance as defined in ISO 13855 and required for the respective application is calculated,
a total reaction time of 35.6 ms must be factored in for the response time of the MSI 420.TMC-03 (MSI 400
hardware + software functionality).
The response times of the sensor and actuator must be considered separately and must be taken from the
respective manufacturer's manual.
Leuze electronic
MSI 420.TMC-03
4
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