MTS FlexTest Models 200 - Manual (Page 22)

MTS FlexTest® Models 40/60/100/200 Controller Hardware
Safety Circuits
Safety Information 22
Input/Output Verification
There are a number of ways that you can verify the integrity of controller input
and output circuits.
Improper use of controller outputs can result in damage to the controller
and unexpected actuator movement.
Unexpected actuator movement can result in injury to personnel or damage
to the equipment.
Outputs should be used to monitor controller functions within the specifications
included in the MTS Series 494 Controller Hardware Manual.
Relay outputs
If necessary, you can use an external device to monitor both NO and NC contacts
to detect state changes and verify relay integrity. You can also provide a
redundant set of contacts to an external device.
Digital inputs
If necessary, you can set up the controller to monitor redundant digital input
signals and use the controller software to verify input circuit integrity and take
action if a problem is identified.
Digital outputs
If necessary, you can provide redundant output signals to external systems.
E-Stop Circuits
Emergency stop (E-stop) circuits include an electro-mechanical switch that when
pressed, removes power from the HPU E-stop relay and forces a global interlock.
Most Series 494 Controllers include E-Stop outputs that are intended to be
monitored by external devices. If necessary, an external device can monitor
multiple E-stop output contacts to detect state changes and verify relay integrity.
WARNING