Pilz PNOZ mm0.2p - Manual (Page 19)

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4-3
4.1 Device properties
4 Function description
Connection of multiple base units:
Any number of base units can be connected via link modules or via the
integrated interface. Each base unit needs a link module or an integrated
interface for the connection between two base units.
However, only a maximum of 4 link modules may be connected to any
one base unit.
Data transmission time:
The t
BUS
data transmission time is the time between the virtual output at
base unit 1 being set and the virtual input at base unit 2 becoming avail-
able (see "Technical details").
The maximum reaction time for series connection of n base units
This is the time between the activation of a safety function at the input
on one base unit and the switching of an output on the connected base
unit.
 The maximum reaction time t
SUM
includes the following times:
t
ON
: Input delay = 4 ms
t
COND
: Switch-off delay of semiconductor output = 30 ms
t
REL
: Switch-off delay of relay output = 50 ms
t
BUS
: Data transmission time between two base units = 35 ms
n: Number of connections between base units
The maximum reaction time t
SUM
for series connection of n base units
 On semiconductor outputs:
tS
UM
= t
ON
+ (n * t
BUS
) + t
COND
 On relay outputs:
t
SUM
= t
ON
+ (n * t
BUS
) + t
REL
CAUTION!
For signals that are forwarded or received via the link module or
interface, a calculation must always be made in accordance with
the above formulas.