Internal circuit diagram
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Figure 5-7 MSS 3RK3 ASIsafe basic internal circuit diagram
Terminal designations of the 3RK3 ASIsafe basic central unit
Terminal Meaning Description
T1 Test output for input F‑IN1
• Test outputs with dierent test signals
• Connection for sensor contacts for detecting cross-
circuits
T2 Test output for input F‑IN2
F-IN1 ... F-IN2 Safety-related sensor in‐
puts
Terminal for safety sensors
Combinations for two-channel connection:
• F-IN1 with F-IN2
IN3 ... IN8 Standard inputs Connection for sensors (non-safety-related)
Q1.1, Q1.2 Safety-related relay output Isolated two-channel output for connecting actuators
Q2 Safety-related semicon‐
ductor output
Two-channel output for connecting actuators
AS-i+, AS-i- AS‑i terminals Connection of the AS-i cable
L+ Power supply 24 V DC
M Ground Ground to 24 V DC
FE Functional ground Shielding, equipotential bonding
Interfaces of the 3RK3 ASIsafe basic central unit
Interface Meaning Description
X1 Device interface Connection of PC or programming device, interface mod‐
ule, diagnostics display
X3 External memory module Slot for external memory module with parameterization
data
The memory module is sealable with the 3RK3 central unit
or the control cabinet.
Description of the hardware
5.1 Description of the individual modules
SIRIUS 3RK3 Modular Safety System
88 Equipment Manual, 07/2020, NEB926253002000/RS-AC/006
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