4.9 Safety Function
4-61
(4) Related Commands
If the HWBB function is working with the /HWBB1 or /HWBB2 signal turned OFF, the setting of IO monitor-
ing field D10 (HBB) changes to 1, so the status of the upper level apparatus can be known by looking at the
setting of this bit.
If the status becomes HWBB status during the execution of the next command, a command warning is issued.
If a warning is given, clear the alarm to return to normal operational status. After stopping or canceling the
action command, using the sequence of commands to return to the HWBB status is recommended.
(5) Error Detection in HWBB Signal
If only the /HWBB1 or /HWBB2 signal is input, an A.Eb1 alarm (Safety Function Signal Input Timing Error)
will occur unless the other signal is input within 10 seconds. This makes it possible to detect failures, such as
disconnection of the HWBB signals.
Object Action Commands
Servo ON (SV_ON)
Interpolating (INTERPORATE)
Positioning (POSING)
Constant speed feed (FEED)
Interpolating with position detection function (LATCH)
External input positioning (EX_POSING)
Homing (ZRET)
CAUTION
• The safety function signal input timing error alarm (A.Eb1) is not a safety-related part of a control system. Keep this
in mind in the system design.
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