Mitsubishi Electric SW1DNN-WS0ADR-B, Руководство по эксплуатации

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Chapter 9
204
Logic programming – Function blocks
9.9.11 Multi operator (multiple two-hand control)
Function block diagram
General description
The Multi operator function block is used to monitor simultaneous operation of up to
three two-hand controls. For example, several two-hand controls or foot switches can
be necessary in a press application with more than one operator in order to trigger the
downward movement of the press. Typically, each
Operator input is connected to a
Two-hand control function block.
Release inputs (e.g. safety light curtains) can be connected optionally in order to
ensure that the assigned devices are High before the Enable output can become High.
Resetting and restarting need to be handled independently of this function block.
The Cycle request input can be used to enforce that each connected two-hand
control is released at least once before another start is possible. Typically this input is
connected to a signal that generates a pulse with each machine cycle. In this way it
can be prevented that one or more of the two-hand controls remain actuated
permanently.
The Operator inputs and the Release inputs must be pre-evaluated signals!
 Connect only safe pre-evaluated signals to the Operator inputs, e.g. the Enable
output of a Two-hand control type IIIA or Two-hand control type IIIC function block.
A safety-relevant evaluation of the inputs of a two-hand control has to be effected
either by another function block (e.g. Two-hand control or Light curtain monitoring)
or as a part of the configuration of the safety inputs (e.g. configuration of the inputs
with dual-channel evaluation).
 The Cycle request input must not be used for safety functionality. This input is for
automation control functionality only.
Parameters of the function block
Parameter Possible values
Cycle request condition  Rising edge
 Falling edge
Number of operators  2 operators
 3 operators
Number of static releases  0
 1
 2
Figure 194:
Function block diagram for
the Multi operator function
block
ATTENTION
Table 91:
Parameters for the Multi
operator function block