Functionality - ABB AC500-S Safety User Manual
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Also See for AC500-S:
- Safety user manual (452 pages) ,
- Application note (24 pages) ,
- System manual (119 pages)
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AC500-S safety modules
AI581-S safety analog input module > Functionality
The inputs are not electrically isolated from the other electronic circuitry of the module.
3.5.2 Functionality
Analog inputs
LED displays
Internal power supply
External power supply
Self-tests and diagnostic functions (both start-up and runtime), like CPU and RAM tests, pro-
gram flow control and cross-talk tests, etc. are implemented in AI581-S according to IEC 61508
SIL 3 requirements.
AI581-S contains 4 safety analog input channels with the following features:
●
14 bit resolution
●
Checking of process power supply (diagnostic message is sent from the safety I/O module
to the CPU informing about the lack of process power supply for the given safety I/O
module). This function is a non-safety one and is not related to the internal safety-relevant
over- and undervoltage detection.
●
Noise rejection 50 Hz or 60 Hz
●
1 channel (0 ... 20 mA), 1 channel (4 ... 20 mA) or 2 channel (4 ... 20 mA) modes (minimum
or maximum value can be selected for transfer to safety CPU in 2 channel (4 ... 20 mA)
mode; tolerance range 4 ... 12 % can be set for 2 channel mode)
108
4 (0 ... 20 mA or 4 ... 20 mA)
for signal status, module errors, channel errors and supply voltage
through the expansion bus interface (I/O bus)
via the terminals ZP and UP (process voltage 24 V DC)
NOTICE!
Only F_Dest_Add is used for PROFIsafe F-Device identification in AI581-S.
NOTICE!
In a 2 channel mode, the lower channel (channels 0/2 ➔ Channel 0, channels
1/3 ➔ Channel 1, etc.) transports the aggregated process value, PROFIsafe
diagnostic bit, acknowledgment request and acknowledge reintegration informa-
tion. The higher channel always provides the passivated value "0".
NOTICE!
The maximal internal discrepancy time between two internal channel values
(1 channel or 2 channel modes) in AI581-S module is 67.5 ms, which is also an
internal worst-case input delay value.
The discrepancy time between two channel values (2 channel mode) with the
selected supervised tolerance range (4 ... 12 %) is also 67.5 ms.
NOTICE!
The analog input channels have built-in hardware low-pass filter of 100 Hz.
3ADR025091M0208, 12, en_US
2020/06/19
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