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Chapter 1
Overview
18
OSSD Tap
The OSSD tap is designed to specifically interface with safety products that
generate OSSD outputs. The OSSD tap does not perform testing on the
OSSD signals as the input device must perform the test.
The OSSD tap is looking to see if the outputs of the connected device are
energized or de-energized. If the outputs are de-energized, then the tap goes to
a safe state, and the input indicator is red. If the outputs of the device are
energized, then the tap shows a solid or flashing green input indicator.
If the OSSD tap inputs are not the same state for three or more seconds, then
the tap enters a recoverable fault state. Both inputs must go to LO and then
back to HI to recover.
EMSS Tap
The EMSS tap is designed to interface with two voltage-free contacts. The tap
applies 24V to one side of the contact on both channels and looks for the 24V
on the monitoring input. These contacts are pulse tested by the tap, see
Testing Functions on page 57
The tap is looking to see if both contacts are closed or open. When the contacts
open, the tap goes to a safe state, and the input indicator is red. When the
contacts close, the tap goes to an operational state, which turns the input
indicator either solid or flashing green.
The EMSS tap has a 10 second simultaneity window. If one contact opens, the
second contact must open within 10 seconds. Similarly, if one contact closes,
the second contact must close within 10 seconds. If the simultaneity window
requirement is not met, the tap goes to a recoverable fault state. To recover,
both contacts must be cycled open and then closed again within 10 seconds.
Guard Locking with GuardLink Systems
Only Power-to-Release guard locking devices can be connected to the
GuardLink taps. When guard locking devices are connected, a 440R-ENETR
interface must be used. The lock and unlock commands can only be issued to
the guard locking devices through the 440R-ENETR interface.
When an unlock request is issued, the DG safety relay turns off OUT X
(terminal X2) immediately and starts the off-delay timer. When the off-delay
timer expires, the DG safety relay issues an unlock command to the GuardLink
circuit and turns off its safety outputs (terminals 13/14 and 23/24).
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
for pulse details.
Pulse
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