Circuit examples AI581-S

This is the web edition of the original ‎⮫ AC500-S safety user manual, version 1.3.2. This web edition is provided for quick reference only. The original safety user manual must be used to meet functional safety application requirements.

Examples of electrical connections and reachable SIL (IEC 61508), max. SIL (IEC 62061) and PL (ISO 13849-1) with AI581-S module are presented below.

NOTICE

Whenever DC = High is used in the circuit examples with safety analog inputs, the following measure from ISO 13849-1⮫ [10] is used with AI581-S module: Cross monitoring of input signals and intermediate results within the logic (L), and temporal and logical software monitor of the program flow and detection of static faults and short circuits (for multiple I/O).

Whenever DC = Medium is used in the circuit examples with safety analog inputs, any of the measures for input devices with DC ³ 90 % can be used from ISO 13849-1⮫ [10].

Analog sensor (0 ... 20 mA)

Max. SIL / PL ^{1), 2)}	Max. SIL 1 / PL c
SIL³⁾	SIL 1

03.05.060_ Circuit example A581-S-01 — Fig. 453: Circuit example AI581-S, analog sensor (0 ... 20 mA)

¹⁾: MTTFd = High, DC = Low
²⁾: Max. SIL (IEC 62061) / max. reachable PL (ISO 13849-1) ➔ without error exclusion (you can reach higher levels up to PL e, max. SIL 3 with error exclusion)
³⁾: Max. reachable SIL acc. IEC 61508 (type A components are required) ➔ without error exclusion (you can reach higher levels up to SIL 3 with error exclusion)

2 analog sensors (0 ... 20 mA)

2-channel evaluation	In AI581-S module
Max. SIL / PL ^{1), 2)}	Max. SIL 2 / PL d
SIL³⁾	SIL 3

03.05.061_Circuit example A581-S-02 — Fig. 454: Circuit example AI581-S, 2 analog sensors (0 ... 20 mA)

¹⁾: MTTFd = High, DC = Medium
²⁾: Max. SIL (IEC 62061) / max. reachable PL (ISO 13849-1) ➔ without error exclusion (you can reach higher levels up to PL e, max. SIL 3 with error exclusion)
³⁾: Max. reachable SIL acc. IEC 61508 (type A components are required)

Analog sensor (4 ... 20 mA)

Max. SIL / PL ^{1), 2)}	Max. SIL 2 / PL d
SIL³⁾	SIL 2

03.05.062_Circuit example A581-S-03 — Fig. 455: Circuit example AI581-S, analog sensor (4 ... 20 mA)

¹⁾: MTTFd = High, DC = Medium
²⁾: Max. SIL (IEC 62061) / max. reachable PL (ISO 13849-1) ➔ without error exclusion (you can reach higher levels up to PL e, max. SIL 3 with error exclusion)
³⁾: Max. reachable SIL acc. IEC 61508 (type A components are required) ➔ without error exclusion (you can reach higher levels up to SIL 3 with error exclusion)

2 analog sensors (4 ... 20 mA)

2-channel evaluation	In AI581-S module
Max. SIL / PL ^{1), 2)}	Max. SIL 3 / PL e
SIL³⁾	SIL 3

03.05.063_Circuit example A581-S-04 — Fig. 456: Circuit example AI581-S, 2 analog sensors (4 ... 20 mA)

¹⁾: MTTFd = High, DC = High
²⁾: Max. SIL (IEC 62061) / max. reachable PL (ISO 13849-1)
³⁾: Max. reachable SIL acc. IEC 61508 (type A components are required)

Transmitter (4 ... 20 mA)

Max. SIL / PL ^{1), 2)}	Max. SIL 2 / PL d
SIL³⁾	SIL 2

03.05.064_Circuit example AI581-S-05 — Fig. 457: Circuit example AI581-S, transmitter (4 ... 20 mA)

¹⁾: MTTFd = High, DC = Medium
²⁾: Max. SIL (IEC 62061) / max. reachable PL (ISO 13849-1) ➔ without error exclusion (you can reach higher levels up to PL e, max. SIL 3 with error exclusion)
³⁾: Max. reachable SIL acc. IEC 61508 (type A components are required) ➔ without error exclusion (you can reach higher levels up to SIL 3 with error exclusion)

2 transmitters (4 ... 20 mA)

2-channel-evaluation	In AI581-S module
Max. SIL / PL ^{1), 2)}	Max. SIL 3 / PL e
SIL³⁾	SIL 3

03.05.065_Circuit example AI581-S-06 — Fig. 458: Circuit example AI581-S, 2 transmitters (4 ... 20 mA)

¹⁾: MTTFd = High, DC = High
²⁾: Max. SIL (IEC 62061) / max. reachable PL (ISO 13849-1)
³⁾: Max. reachable SIL acc. IEC 61508 (type A components are required)