Ws0-Xtdi Safety Input Module - Mitsubishi MELSEC-WS0-CPU0 User Manual

Safety controller

Table of Contents

Table 59:

Data sheet WS0-XTDI

Technical data

In the case of a fault (0 V cable open circuit) with a load resistance of min. 2.5 kΩ, 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.

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.

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.

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.

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.)

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

SIL claim limit