Sensor muting – Rockwell Automation 440C Guardmaster 440C-CR30 Configurable Safety Relay User Manual User Manual
Page 57
Rockwell Automation Publication 440C-UM001C-EN-P - November 2014
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Safety Monitoring Functions
Chapter 9
shows the muting and synchronization times that are selectable in the
CCW. These times are selected independently. For example, you can select two
minute muting time, a 500 ms synchronization time between MS1 and MS2, and
a 1000 ms synchronization time between MS2 and the light curtain.
Note:
The synchronization time also depends on the input filter time
settings for the muting sensor inputs.
Synchronization time (total) = 2 x Input Filter Time + Synch Time
Table 5 - Muting and Synchronization Times for ‘2L’ Muting
4-Sensor Muting
The sensors and light curtain form the shape of an upside down “T”, when
viewed from the side. Two muting sensors (MS) are mounted on either side of the
light curtain (LC).
Figure 52 - 4-Sensor Muting
The material can travel in either direction; breaking MS1 first and MS4 last or
breaking MS4 first and MS1 last. The muting lamp turns on and the light curtain
is muted after the second sensor is blocked. The object must be large enough to
break all four sensors.
In the example below, the OSSD outputs of the light curtain are connected to
terminals 00 and 01. The four muting sensors are connected to terminals 02 to
05. The momentary, normally open override switch is connected between
terminals 12 to 06 to take advantage of pulse testing. Contactor K1 and K2,
which provide power to the conveyor (and other hazards if necessary), are
connected to terminals 18 and 19.
The muting lamp is connected to terminal 13; this terminal should be configured
with no pulse testing. Filament lamps will not be affected by pulse testing, but
LED lamps may appear to flicker if pulse testing is enabled.
Muting Time Units
Available Values
Synchronization Time
Available Values
Seconds
1…59
MS1 to MS2
50…10,000 ms in
50 ms increments
Minutes
1…59
MS2 to LC
Hours
1…23
Days
1…10
Machine
MS1
MS2
MS3
MS4
LC
Muting Lamp
Material
Mut
ed L
C
Conveyor