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The following sections deal only with Category 2, Category 3, and Category 4 applications, as described by ISO 13849-1 (1999). The

following figure provides a snapshot of the possible safety categories that can be achieved for each device type, depending on the selec-

ted circuit option. Refer to the text sections following, as well as the appropriate standards, for further information.

Circuit Symbol

E-Stop Safety

Gate

Optical

Sensor

Two-Hand

Control

Rope

Pull

Protect.

Stop

Safety

Mat

Enabling

Device

Cat. 2 Cat. 2 Cat. 2 — Cat. 2 Cat. 2 — —

Cat. 3

Cat. 2

Cat. 3

Cat. 2

Cat. 3

Type IIIa Cat. 1

Type IIIb Cat. 3

Cat. 3

Cat. 2

Cat. 3

—

Cat. 2

Cat. 3

Cat. 2

Cat. 3

Cat. 4

Cat. 2

Cat. 3

Cat. 4

Cat. 2

Cat. 3

Cat. 4

Type IIIa Cat. 1

Cat. 2

Cat. 3

Cat. 4

Cat. 2

Cat. 3

Cat. 4

—

Cat. 2

Cat. 3

Cat. 4

Cat. 2

Cat. 3

Cat. 4

Cat. 2

Cat. 3

Cat. 4

Type IIIa Cat. 1

Type IIIb Cat. 3

Cat. 4

Cat. 2

Cat. 3

Cat. 4

—

Cat. 2

Cat. 3

Cat. 4

—

Cat. 2

Cat. 3

Cat. 4

Cat. 2

Cat. 3

Cat. 4

—

Cat. 2

Cat. 3

Cat. 4

Cat. 2

Cat. 3

Cat. 4

—

Cat. 2

Cat. 3

Cat. 4

—

Cat. 2

Cat. 3

Cat. 4

Cat. 2

Cat. 3

Cat. 4

—

Cat. 2

Cat. 3

Cat. 4

Cat. 2

Cat. 3

Cat. 4

—

Cat. 2

Cat. 3

Cat. 4

—

Cat. 3

Cat. 4

— Type III c Cat. 4 — — —

Cat. 3

Cat. 4

—

Cat. 3

Cat. 4

— Type III c Cat. 4 — — —

Cat. 3

Cat. 4

— — — — — —

Cat. 2

Cat. 3

—

NOTES

• Cat. B or 1 is assumed when not using safety-rated devices.

• All safety input device contacts are shown in the ON/active state (e.g., E-stop in the armed state, safety gate in the

closed state, light screen in the clear state, etc.)

• Cat. B/1, 2, 3 and 4 are per ISO 13849-1 (EN 954-1), except for two-hand control.

• Two-hand categories are per ISO 13851.

24V

ONON

24V

OFFON

24V

OFFON OFFON

Figure 59. Input devices, circuit options, and their potential safety categories

WARNING: . . . Safety Categories

The level of safety circuit integrity can be greatly impacted by the design and installation of the safety devices and the means

of interfacing of those devices. A risk assessment must be performed to determine the appropriate safety circuit integ-

rity level or safety category as described by ISO 13849-1 (EN 954-1) to ensure that the expected risk reduction is

achieved and that all relevant regulations and standards are complied with.

SC22-3/-3E Safety Controller Instruction Manual

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