AUTEM PLC-ANALYZER pro 6, Quick Start Manual

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PLC-ANALYZER pro 6 - PILZ PSS / PNOZ
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Time behaviour and particularities
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NOTE
Acquiring data with PLC-ANALYZER pro results in a small increase in cycle time in the
PLC to the same manner as it happens with programming software PSS WIN-PRO in
the online-mode.
The intervals between scan transfers from the PILZ PLC to the computer are depending on the following
items:

CPU type

cycle time of PLC

Number of recorded addresses.
For the PSS SB 3006-3 ETH-2 the scan interval for a address is approximately 5 ms, i.e. for a cycle time > 5
ms there is one scan for each cycle. For a longer PLC cycle time data transfer is synchronized with the PLC
cycle. For a shorter cycle time the computer does not obtain a scan for each cycle, resulting in a partial
loss of information. This loss can be compensated by repeated measurements of the interesting signals.
Every additional requested address leads to an increase in scan time of about 0.1 ms. The following
table exemplarily shows some values of time behaviour during acquisition:
Requested data Scan time
1 flag byte 5 ms
50 flag words 11 ms
100 flag words 22 ms
1 flag byte, 1 output byte 5 ms
50 flag byte, 50 data words 23 ms
10 flag words, 10 data words, 10 inputs, 10 outputs 10 ms
Table 1-2 Scan times on PSS SB 3006-3 ETH-2
The following table shows typical scan times for PILZ PSS 3046 (cycle time ca. 40ms):
Scandata Scan time
1 Byte 90 ms
32 Words 120 ms
Table 1-3 Recording time PILZ PSS 3046