Wintriss Shadow VI, User Manual

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1107200 Shadow VI User Manual
page 56 Chapter 2 Installation and Checkout
8B. Wiring Shadow to a PLC
DANGER
!
INCORRECT WIRING TO A PLC
•
Ensure that the light curtain control is properly wired to your PLC.
•
Follow the guidelines in the applicable ANSI standard, ANSI B11.1. The guidelines below
serve as a reminder of the importance of connecting your light curtain correctly when using a
PLC. Do not wire the outputs in series when connecting Shadow to a PLC.
•
Be aware that the details of wiring and programming the PLC are solely your responsibility,
and not Wintriss’s.
•
Use a single safety PLC or multiple non-safety PLCs.
Failure to comply with these instructions will result in death or serious injury.
CAUTION
TERMINAL BLOCK TB4 WIRED INCORRECTLY
Wire stop circuits to the upper level of terminal block TB4, not the lower level. If you wire to
the lower level, this could damage components on the circuit board.
Failure to comply with these instructions could result in property damage.
When wiring the control to a Programmable Logic Controller (PLC) or other type of
microprocessor-based control, two (or more) independent logic systems should be used to
control the press's stop circuit.
Wintriss does not provide specific step-by-step instructions
for connecting Shadows to PLCs. This is because of the variety of PLCs and the various
programming techniques used. Only general guidelines are supplied in this section. Refer to
Figure 4 at the end of the manual for suggested wiring.
We recommend you carefully study the ANSI guidelines in Appendix C of the ANSI B11.1
standards before connecting Shadow to a PLC. Appendix C gives detailed guidelines for
using PLCs to control the clutch and brake on metal stamping presses. Appendix C is entitled
"Some Considerations for Design of Microprocessor-Based Clutch/Brake Controls."
To ensure maximum safety, you must wire and program the PLC so it can detect an internal
component failure and immediately stop the press. Both outputs from Shadow's control
relays must be connected separately to a PLC. These outputs are marked "FSD1" and
"FSD2" (see Figure 2-20). You must remove the factory-installed jumper (as shown in
Figure 4 at the end of the manual) when connecting to a PLC.
Next, you must create a program that will check each input signal from the Shadow relays
independently. The program should stop the press immediately if the input signals ever
differ. That way, a component failure within the PLC will be immediately detected. Also,
with Shadow relays wired to the PLC separately, if one of Shadow's control relay contacts
were to weld shut preventing the stop signal to the PLC, the other relay contact would still
open to send the stop signal.
If you do not connect the control to the PLC properly, here is what could happen. A
component in the PLC fails. This causes the PLC to incorrectly read the input signals. Even