4 Safety Function Blocks
4 - 64
NX-series Safety Control Unit Instructions Reference Manual (Z931)
• The FB handles a mode selection switch with up to eight positions.
• You can change the mode to change the operation mode of the machine (automatic mode, manual
mode, semi-automatic mode, etc.).
• It is assumed that the machine is in safe mode when the Controller is started. The inputs to the FB
(e.g., a machine start button) change the mode to the mode that is set on the mode selection switch
when the machine is started.
• The default state after the FB is activated is the ModeChanged state. This is the safe state for the FB,
in which all
S_ModeXSel
outputs and the
S_AnyModeSel
output are FALSE.
• When the mode selection switch is changed and the FB is in the ModeChanged state:
• If
AutoSetMode
is FALSE: A new
S_ModeX
input is acknowledged by
S_SetMode
changing to
TRUE to produce a new
S_ModeXSel
output.
• If
AutoSetMode
is TRUE: A new
S_ModeX
automatically produces a new
S_ModeXSel
output.
• When an
S_ModeX
input is TRUE, only transitions such as from 8005 to 8000 are valid. As long
as
S_ModeX
is FALSE, the FB will retain state 8005 even if a change to TRUE is detected for
S_SetMode
.
• The time is not monitored for a transition from the ModeChanged to the ModeSelected state, i.e.,
when
S_SetMode
is changed to TRUE by the operator.
• If the FB is in the ModeSelected state when a new
S_ModeX
input (high priority) and an
S_Unlock
signal (low priority) change to FALSE at the same time, the FB will enter the ModeChanged state.
• You can set constants with the default FALSE state for
S_ModeX
inputs that are not used for mode
selection to simplify program validation.
• Set the
AutoSetMode
input to TRUE only when you can ensure that no hazardous state will occur as
the result of starting the Safety CPU Unit.
Precautions for Correct Use
An error will occur for this function if more than one
S_ModeX
input changes to TRUE at the
same time. Use a non-shorting mode selection switch.
Function
Содержание NX-SL series
Страница 8: ...CONTENTS 6 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Страница 14: ...Terms and Conditions Agreement 12 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Страница 28: ...Sections in this Manual 26 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Страница 98: ...2 Standard Functions 2 64 NX series Safety Control Unit Instructions Reference Manual Z931 ...
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Страница 130: ...3 Safety Standard Function Blocks 3 20 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Страница 265: ...I 1 I NX series Safety Control Unit Instructions Reference Manual Z931 Index ...
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