Internal safe digital output F-DO_STO

The safety option has an internal safe digital output for switching the inverter's internal STO function as well as 3 additional axes of the MOVIDRIVE® modular/system/technology application inverter. No other components may be connected to the inverter's STO terminal X6.

The following conditions apply for shutting down the 3 additional axes:

  • The cable length is limited to a maximum of 3 m up to the last axis.
  • Cabling is permitted only within a control cabinet.
  • The M-terminal of the individual axes must also be connected.
  • No CS..A safety option is allowed to be installed in the additional axes.
  • F‑DO_STO's advanced diagnostics is available only for the device's internal STO circuit of the axis with a plugged CS..A safety option.
  • For the additional axes, only short circuits of the cabling are detected.
  • A connection according to the following figure is permissible:

[1]

STO terminal X6 of a MOVI-C® MOVIDRIVE® with a CS..A safety option

[2]

STO terminal X6 of a MOVI-C® MOVIDRIVE® without a CS..A safety option

A maximum switching frequency of 10 Hz is permitted for the internal safe digital output. The switching state of the internal safe digital output must be stable "1" for at least 2 seconds or stable "0" for 2.5 seconds (with activated extended diagnostics) at least once within 60 seconds.

The internal safe digital output F‑DO_STO is always operated in the connection type "2‑pole sourcing output" and must only be used for the STO function of the inverter. If the diagnostics implemented for the internal safe digital output F‑DO_STO detects a fault, the error response "output error" occurs, which disables all outputs.

Additional extended diagnostics can be activated for the internal safe digital output F‑DO_STO. If a fault is detected by diagnostics, the "output error" error response occurs, which disables all outputs.

The following settings can be made for extended diagnostics:

  • Setting "Test when deactivated"
  • If this setting is active, the functionality of diagnostics in the STO connection of the inverter is tested right after the STO function is deactivated.
  • "Test when deactivated and time monitoring" setting
  • This setting is identical to the "Test when deactivated" option. If diagnostics has not been performed within 8 hours, the safety option will additionally issue a warning. Time monitoring works properly only if the safety option deactivates the STO function before the diagnostics interval of 8 hours has elapsed. The test is not performed when switching on the safety option.
  • Switching the safety option on/off cyclically is not allowed when using the time monitoring because when it is switched on again the time monitoring is reset and no test is performed. The safety option outputs a warning signal 8 hours after the last test after being switched on.