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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. |
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Analog inputs |
4 (0 ... 20 mA or 4 ... 20 mA) |
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LED displays |
for signal status, module errors, channel errors and supply voltage |
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Internal power supply |
through the I/O bus interface |
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External power supply |
via the terminals ZP and UP (process voltage 24 V DC) |
Self-tests and diagnostic functions (both start-up and runtime), like CPU and RAM tests, program flow control and cross-talk tests, etc. are implemented in AI581-S according to IEC 61508 SIL 3 requirements.
NOTICE
Only F_Dest_Add is used for PROFIsafe F-Device identification in AI581-S.
AI581-S contains 4 safety analog input channels with the following features:
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14 bit resolution.
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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.
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Noise rejection 50 Hz or 60 Hz.
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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).
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 information. 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.
NOTICE
In case of the overcurrent/undercurrent detected at the safety analog input channel, the channel passivation takes place latest after 200 ms. The channel remains passivated for 30 s and then the check is performed if the overcurrent/undercurrent still present or not. If the overcurrent/undercurrent has gone, then reintegration request signal for the given channel is set to TRUE to allow channel reintegration.
The following table shows the mapping of safety CPU process values to the values in mA from AI581-S module. Two modes are defined for an analog input 0 ... 20 mA and 4 ... 20 mA.
NOTICE
Both overflow and overrange represent an overcurrent. Both underflow and underrange represent an undercurrent.
Only in case of overflow and underflow, the analog channels are passivated and "0" process values are delivered to the safety CPU.
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Range |
0 ... 20 mA |
4 ... 20 mA |
Digital value (dec) |
Digital value (hex) |
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|---|---|---|---|---|---|---|
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Overflow* |
: > 23.519 |
: > 22.81 |
32767* : 32512* |
7FFF* : 7F00* |
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Overrange |
23.519 : 20.000723 |
22.81 : 20.000578 |
32511 : 27649 |
7EFF : 6C01 |
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Nominal range |
20
:
0 |
20 : 16 : 4 |
27648 : 20736 : 0 |
6C00 : 5100 : 0000 |
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Underrange |
-0.000723 : -1.481 |
3.999421 : 1.185 |
0 ... 20 mA |
4 ... 20 mA |
0 ... 20 mA |
4 ... 20 mA |
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-1 : -2048 |
-1 : -4864 |
FFFF : F800 |
FFFF : ED00 |
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Underflow* |
< -1.481
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< 1.185
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0 ... 20 mA |
4 ... 20 mA |
0 ... 20 mA |
4 ... 20 mA |
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-2049* : -32768* |
-4865* : -32678* |
F7FF* : 8000* |
ECFF* : 8000* |
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* In these cases, the analog channels are passivated and "0" process values are delivered to the safety CPU.