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7
PRSU Series, Operating Instructions Manual (Revision 1.0)
Recommended Limits
Performance of the PRSU/2, PRSU/4 and PRSU/5 are limited according to the values listed on
Pages 13 and 14 of this manual.
In particular, a 200Ω limit on short-circuit (actuated state) series
resistance is required for four-wire, fail-safe applications. The overall series resistance of different
products, cables and layouts can vary greatly. To ensure that a particular application will require
only a single PRSU/2, PRSU/4 or PRSU/5, the following rule-of-thumb guidelines can be used:
Recommended Application Limits
Product Type
Maximum Area
Maximum Length
ControlMat, ArmorMat, DPM
100ft²
N/A
Sensing Edge Products (all)
N/A
200ft
Ribbon Switches
N/A
200ft
SE-45, SE-75, SE-C Bumpers
N/A
200ft
All values listed assuming 20AWG/4, Ø3/16, lead cable @ 500ft max.
Table 4: Safety Product Recommended Limits
Common Device Configurations
See below for graphical representation of lead styles.
Product Type
S11
S21
S12
S22
Single Lead, Fail-safe
BLACK
RED
YELLOW
WHITE
Dual Lead, Fail-safe, Style 1
BLACK
1
WHITE
1
BLACK
2
WHITE
2
Dual Lead, Fail-Safe, Style 2
RIBBED
1
SMOOTH
1
RIBBED
2
SMOOTH
2
Table 5: Common Wiring Configurations
