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6.4 Safety Input Device Function
ES GS OS RP PS SM THC ED
1 & 2 Terminal
Single Channel
(see note 1)
Cat 2 Cat 2 Cat 2 Cat 2 Cat 2
2 & 3 Terminal
Dual Channel
(See note 2)
Cat 3 Cat 3 Cat 3 Cat 3 Cat 3
Type IIIa Cat 1
Type IIIb Cat 3
Cat 3
2 Terminal Dual Channel
PNP
w/ integral monitoring
(see note 3)
Cat 4 Cat 4 Cat 4 Cat 4 Cat 4 Type IIIa Cat 1 Cat 4
3 & 4 Terminal
Dual Channel
(see notes 2 & 4)
Cat 4 Cat 4 Cat 4 Cat 4 Cat 4
Type IIIa Cat 1
Type IIIb Cat 3
Cat 4
2 & 3 Terminal Dual Channel
Complimentary
Cat 4 Cat 4 Cat 4 Cat 4 Cat 4
2 Terminal Dual Channel
Complimentary PNP
Cat 4 Cat 4 Cat 4 Cat 4 Cat 4
4 & 5 Terminal Dual Channel
Complimentary
Cat 4
Type IIIc Cat 4
Cat 4
4 Terminal Dual Channel
Complimentary PNP
Cat 4
Type IIIc Cat 4
Cat 4
4 Terminal Safety Mat Cat 3
Circuits shown in Run State Circuits shown in Stop State
General Circuit Symbols
24V
24V
ON ON
OFF ON
24V
24V
OFF ON OFF ON
Figure 58. Input Device Circuit—Safety Category Guide
WARNING: Incomplete Information—many installation considerations that are necessary to properly apply input devices
are not covered in this document. Refer to the appropriate device installation instructions to ensure the safe
application of the device.
WARNING: This table lists the highest safety categories possible for common safety rated input device circuits. If the
additional requirements stated in the notes below are not possible due to safety device or installation limitations, or if, for
example, the controller's IOx input terminals are all in use, then the highest safety category may not be possible.
Tip: INx & IOx input terminals, these circuits can be manually configured to meet Category 4 circuit requirements by
changing the first (left most) standard input terminal (INx) to any available convertible terminal (IOx) as shown below. These
circuits will detect shorts to other power sources and between channels when the input has been in the Stop state for at least
2 seconds.
Notes:
1. Circuit typically meets up to ISO 13849-1 Category 2 if input devices are safety rated and fault exclusion wiring practices prevent a) shorts
across the contacts or solid state devices and b) shorts to other power sources.
2. Circuit typically meets up to ISO 13849-1 Category 3 if input devices are safety rated (see Tip: INx & IOx input terminals above).
The 2 Terminal circuit detects a single channel short to other power sources when the contacts open and close again (concurrency fault).
The 3 Terminal circuit detects a short to other power sources whether the contacts are open or closed.
3. Circuit meets up to ISO 13849-1 Category 4 if input devices are safety rated and provide internal monitor of the PNP outputs to detect a)
shorts across channels and b) shorts to other power sources.
4. Circuit meets up to ISO 13849-1 Category 4 if input devices are safety rated (see Tip: INx & IOx input terminals above). These circuits can
detect both shorts to other power sources and shorts between channels.
XS/SC26-2 Safety Controller
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