Mitsubishi MELSEC-WS series, User Manual

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Chapter 12
104
Technical data
*4 In the case of a fault (0 V cable open circuit) with a load resistance of min. 2.5 k Ω , maximally the
leakage current flows from the safe output. For smaller load resistors the leakage current may be
greater but in this case the output voltage will be < 5 V. The connected device, e.g. relay or fail-safe
programmable controller) must detect this status as Low.
*5 When active, the outputs are tested cyclically (brief switching to Low). When selecting the
downstream controllers, make sure that the test pulses do not result in deactivation when using the
above parameters or disable the test pulses on the outputs.
*6 If safe outputs are used without test pulses, at least once per year either all safe outputs without test
pulses have to be switched off at the same time for at least 1 second or alternatively a power reset
has to be performed.
*7 If safe outputs are used without test pulses: Use protected or separate cabling for the safe outputs
without test pulses, because a short circuit to 24 V can not be detected if the safe output is High. This
could inhibit the switch-off capability for the other safe outputs in case of an internal detected
hardware failure due to reverse powering.
*8 Make sure to limit the individual line core resistance to the downstream controller to this value to
ensure that a short-circuit between the outputs is safely detected. (Also note IEC 60204 Electrical
Machine Equipment, Part 1: General Requirements.)
*9 Examples for resulting max. coil inductivity:
HW V1.00.0: 1760 mH @ 0.5A, 440 mH @ 1A, 110 mH @ 2A
HW V1.01.0: 2960 mH @ 0.5A, 740 mH @ 1A, 185 mH @ 2A
12.2.3 WS0-XTDI safety input module
Safety-related parameters
This information relates to an ambient temperature of +40 °C, which is normally
used for the statistical calculation of the values.
Safety Integrity Level SIL3 (IEC 61508)
SIL claim limit SIL CL3 (IEC 62061)
Category Category 4 (EN/ISO 13849-1)
Performance Level PLe (EN/ISO 13849-1)
PFHd (mean probability of a
dangerous failure per hour)
0.4 × 10
–9
T
M
(mission time) 20 years (EN/ISO 13849)
Table 59:
Data sheet WS0-XTDI