MTS FlexTest Models 200 - Manual (Page 25)

Safety Circuits
MTS FlexTest® Models 40/60/100/200 Controller Hardware Safety Information 25
E-Stop and Hardware Interlocks
The following table shows E-stop/interlock operation for a typical system that
uses Series 793 Control Software. Interlock and E-stop operation on some test
systems may vary.
E-stop and Hardware Interlock Events/Actions (Series 793 Control Software)
E-S TOP G LOBAL (C ONTROLLER ) I NTERLOCK S TATION I NTERLOCK
An E-stop occurs when the
operator presses an electro-
mechanical E-stop switch. Any of the following events results
in a global interlock:
• Undervoltage conditions on
auxiliary power outputs.
• Controller conditions such as
watchdog timers and
backplane monitoring.
• E-stop button pressed.
Any of the following events results
in a station interlock:
• Software events (such as
limits).
• External interlock input
active.
• Station Stop button pressed.
An active E-stop causes the
following actions:
• Physically removes power
from the HPU CRM E-stop
relay.
Note The CRM E-stop relay is
located in the HPU.
• Forces a global interlock.
A global interlock applies the
following actions to each of the
hardware interlock chains:
• Sets the controller HPU
commands to off.
• Sets each controller HSM
command to off.
• Sets the controller function
generator/program (for all
stations) to off.
• If enabled, the valve driver
current is clamped to a
predefined value/polarity.
A station interlock applies the
following actions to the single
hardware interlock chain where
that station is assigned:
• Sets the station HSM
command to off.
• Sets the controller function
generator/program (for that
station only) to off.
• If enabled, the valve driver
current is clamped to a
predefined value/polarity.
E-Stop outputs are intended to be
monitored by external devices. Interlock outputs are intended to be
monitored by external devices. Interlock outputs are intended to be
monitored by external devices.
Note If necessary, an external I/O monitoring device can monitor multiple E-stop/Interlock output contacts to
detect state changes and verify relay integrity.