11 Safety Function
11.3 Safety Logic Circuit
11-6
HW1485509
HW1485509
11.3 Safety Logic Circuit
11.3.1 Introduction
The safety logic circuit is a is a feature used for programming the basic
safety logic of the system using a simple ladder logic programming
interface. It enables to set up the logical operations, such as stopping the
manipulator and outputting the servo ON signal.
The followings are the contents of this function:
– Executes the safety logic circuit by the safety circuit board in
compliance with safety certification.
– The safety logic circuit consists of a “System” section and a “User”
section.
– The System section of the safety logic circuit is the specific circuit of
YASKAWA and cannot be edited. The User section allows users to
add/edit their own safety logic.
– Both the System and User sections of the safety logic circuit consist
of a circuit with two inputs and one output or a circuit with one input
and one output.
– Both the System and User sections of the safety logic circuit consist
of 128 lines.
– Both the System and User sections of the safety logic circuit are
executed on a 2ms cycle.
– Both the System and User sections of the safety logic circuit can be
viewed in all security modes; however, the user section can be
edited only when the security mode is “SAFETY MODE”, and the
system is in MANUAL (TEACH) mode with the servo power turned
OFF.
– Conventionally, some functions were performed only by using hard-
wired signals. With the YRC Controller, by using an optional safety
PLC and an optional safety logic circuit, these functions can be
controlled from the safety PLC. This enables less wiring. Meanwhile,
the signals which have been controlled by hardware are always
monitored. Thus, the safety function, which turns OFF the servo
power supply when the error is detected, is maintained.
The YRC Controller with an optional Safety PLC and optional Safety
Logic Circuit can be controlled with the Ethernet Cable wiring. This
is an improvement over previous conventional systems that required
hard wired solutions.
The signals that are controlled by hardware are always monitored so
the safety function that turns off the servo power supply when errors
are detected is maintained.
To Next Page
Loading...
