PA SDI-Drives Midi™ / Maxi™
Edition
07.44
Power Automation
2.3.6 Example using Safety PLC
In order to reach the control category of EN 954 Part 1, Part 2 category 3 and ISO 13849
performance level “d”, the signal ”SAFE LOCK” must be additionally verified. This requires
external wiring. The external wiring must be adapted to the existing safety concepts and
checked for the correct operation.
The holding brake circuitry reaches EN 954 Part 1, Part 2 category 1 and ISO 13849
performance level “c” for the electrical circuitry.
The Safety-PLC must have two (or three) safe outputs and one safe input to bring the
S1300 into the safe state. One side of the “SAFE LOCK” relay contact (S1/S2) is connected
to 24V and the other to the PLC Input 1.
I/O at interface board
Separate manual holding
brake operation
Holding brake controlled
only in operation mode
LOCK
PLC Output 1
PLC Output 1
ENABLE
PLC Output 2
PLC Output 2
EN-BRAKE
PLC Output 3
PLC Output 2
“SAFE LOCK”
PLC Input 1
PLC Input1
The PLC must be programmed to meet the following requirements:
•
The output and the input states are checked for plausibility according to the
following table
•
If an impermissible state is detected, the entire system is put into a safe s
If the state of the inputs has changed from high to low, the contact of the
“SAFE LOCK” relay closes by about 0.6 sec delayed. If the state of the inputs
has changed from low to
tate
•
high, the contact of the “SAFE LOCK” relay opens by
about 0.1 sec delayed.
t
I
S ate of the nputs
LOCK ENABLE EN-BRAKE
all Inputs
“SAFE LOCK”
Description
Nor-
signal of
State of Output
Low Low
Low
High C
r
rake
ontact
closed
after 0.6 sec
Safe state for moto
and holding b
High
Low
Low
Low
Contact open
Unsafe state
Low
High
Low
Low
Contact open
Unsafe state
High
High
Low
Low
Contact open
Unsafe state
Low
Low
High
Low
Contact open
le
= 1
Safe state for motor,
manually operation of
holding brake possib
with
K-BRAKE
High
Low
High
Low
Contact open
Unsafe state
Low
High
High
Low
Contact open
Unsafe state
High High
High
Low
after 0.1 sec of
tr
NOR-signal
Normal operation
Contact
opens
Low/High
ansition of the
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SDI Interface Manual
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