ABB AC500 PLC - 1.1.1.2 Connections; 1.1.1.2.1 I;O Bus; 1.1.1.2.2 Power Supply

1.1.1.2 Connections
1.1.1.2.1 I/O Bus
The I/O bus is the I/O data bus for the I/O modules. Through this bus, I/O and diagnosis data
are transferred between the processor module and the I/O modules. Up to 10 I/O modules can
be added (see description for I/O bus in the system assembly chapter Ä Chapter 2.4.1 “Serial
I/O Bus” on page 1178).
1.1.1.2.2 Power Supply
The supply voltage of 24 VDC is connected to a removable 5-pin terminal block. L+/M exist
twice. It is therefore possible to feed e.g. external sensors (up to 8 A max. with 1.5 mm
2
con-
ductor) via these terminals.
Pin Assignment Label Function Description
Terminal block
removed
Terminal block
inserted
L+ +24 VDC Positive pin of the
power supply voltage
L+ +24 VDC Positive pin of the
power supply voltage
M 0 V Negative pin of the
power supply voltage
M 0 V Negative pin of the
power supply voltage
FE Functional earth
NOTICE!
Risk of damaging the processor module and terminal base!
Exceeding the maximum voltage could lead to unrecoverable damage to the
system.
The system could be destroyed.
NOTICE!
Risk of malfunction!
To ensure reliability and proper functionality, the supply voltage must ramp-up
from 0 V to 24 V within max. 2.5 s
NOTICE!
Risk of damaging the terminal base and power supply!
Short circuits might damage the terminal base and power supply.
Make sure that the four clamps L+ and M (two of each) are not wrongly con-
nected (e. g. +/- of power supply is connected to both L+/L+ or both M/M)
Pin Assignment
Faulty wiring on
power supply
terminals
Device Specifications
Terminal Bases (AC500 Standard) > TB51x-TB54x
2019/04/17 3ADR010121, 13, en_US 7