Rockwell Automation 21G PowerFlex 750-Series AC Drives Reference Manual - Manual (Page 35)

Rockwell Automation Publication 750-RM001F-EN-P - February 2012 35
Chapter
4
Speed Monitoring I/O Signals
Introduction This chapter describes the input and output signals of the Safe Speed Monitor
Option module.
Inputs The safety option has five inputs capable of safety-certified dual-channel support.
Each dual-channel input supports a specific safety function of the drive: Safe
Stop, Safe Limited Speed, Door Monitoring, Enabling Switch Monitoring, and
Lock Monitoring.
All five inputs are electrically identical and rely on the same pair of pulse test
outputs, Test_Out_0 and Test_Out_1, when not using the OSSD configuration.
The inputs can be configured for one of the following settings:
• 1 = Dual-channel equivalent (2 Normally Closed)
• 2 = Dual-channel equivalent 3 s (2 Normally Closed 3 Seconds)
• 3 = Dual-channel complementary (1 Normally Closed + 1 Normally
Open)
• 4 = Dual-channel complementary 3 s (1 Normally Closed + 1 Normally
Open 3 Seconds)
• 5 = Dual-channel SS equivalent 3 s (2 Output Signal Switching Devices 3
Seconds)
• 6 = Single Channel
When configured for dual-channel operation, the consistency between the two
channels is evaluated. For dual-channel equivalent configurations, the active state
for both channel 0 and channel 1 is ON. For dual-channel complementary
configurations, the active state for channel 0 is ON and the active state for
channel 1 is OFF. Any time both channels are not active, the input pair is
evaluated as OFF.
When both channels are active, if one channel’s input terminal transitions from
active to inactive and back to active, while the other channel’s input terminal
remains active, both channels must go inactive at the same time before the
evaluated status may return to ON. This condition is called “cycle inputs
required.”
Topic Page
Inputs 35
Outputs 41
IMPORTANT Single-channel configuration (1NC) is not SIL CL3, PL e, Cat 4.