2
GFK-2734
Chapter 2 Product description
2-15
2.12
Process data words
VersaSafe
The module occupies four words in the VersaPoint system. For information about how
these words are mapped, please refer to the documentation for the configurable logic
module used.
The module has feedback data and enable data.
Feedback data
The bits in this register mirror the states of the digital outputs as diagnostic data. This data
can be used if an output has been parameterized with a switch-off delay. In this case, the
feedback data can be used to determine the actual state of the output and derive
information for the standard control process from this.
Please note that the feedback data for certain errors (e.g., communication error) can differ
from the actual state of the outputs.
Do not use the diagnostic data to execute safety-related functions or actions.
The structure and function of the register are as follows:
Enable
The enable principle is implemented in the VersaSafe system. For this, all modules with
local outputs have an enable function integrated in the device firmware (ANDed bit-by-bit)
for each safe output channel. The enable function can be parameterized
(enabled/disabled) for each specific channel (see Section "Parameterization of the safe
relay outputs" on page 5-2). The structure and function of the register are as follows:
When the enable function is enabled, the relevant safe output is ANDed bit-by-bit with the
corresponding output bit of the standard control system (Data-PSDO register). This output
is then only set if the result of the safety function calculation permits this and the standard
control system has set the corresponding output in the Data-PSDO register (see also user
manual for the configurable logic module used).
The enable function is performed according to the single-channel or two-channel
parameterization of the safe outputs.
For the assignment of the illustrated (byte.bit) view to your control or computer system,
please refer to the DB GB IBS SYS ADDRESS data sheet.
Table 2-1
Feedback-Data register (mirrored data)
7
6
5
4
3
2
1
0
Single-channel
0
0
0
0
OUT1_
Ch2
OUT1_
Ch1
OUT0_
Ch2
OUT0_
Ch1
Two-channel
0
0
0
0
Do not
evaluate
OUT1_
Ch1&2
Do not
evaluate
OUT0_
Ch1&2
Table 2-2
Enable data register
7
6
5
4
3
2
1
0
Single-channel
0
0
0
0
OUT1_
Ch2
OUT1_
Ch1
OUT0_
Ch2
OUT0_
Ch1
Two-channel
0
0
0
0
0
OUT1_
Ch1&2
0
OUT0_
Ch1&2
Содержание VersaSafe VersaPoint IC220SDL840
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