ABB DC523, article 1SAP240500R0001, expands an AC500 S500 station with 24 configurable one-wire channels. The module combines a high point density with 0.5 A transistor-output capability, process-supply diagnostics and fast-counter resources on the documented channel group.

Manufacturer	ABB
Article Number	1SAP240500R0001
Product Family	AC500 S500
Configurable Channels	24 digital inputs/outputs
Connection Method	1-wire
Nominal Signal Voltage	24 V DC
Maximum Output Current	0.5 A per channel
Input Type	EN 61131-2 Type 1
Typical Input Delay	8 ms, configurable from 0.1 to 32 ms
Sensor Supply	24 V DC, maximum 0.5 A total
Fast-Counter Inputs	C16 and C17
Fast-Counter Output	C18
Isolation	Module-wise galvanic isolation
Terminal Units	TU515 or TU516
I/O-Bus Current	Approximately 2 mA
Maximum Unloaded Dissipation	6 W
Product Lifecycle	Active

• Provides 24 application-configurable DC points in a compact S500 module.
• Uses a one-wire field arrangement to increase discrete I/O density.
• Supports 24 V DC transistor outputs up to the documented 0.5 A channel rating.
• Allows the input delay to be configured for signal filtering or response requirements.
• Provides fast-counter inputs and an associated output on the ABB-defined channels.
• Shows channel, process-supply and module diagnostic state on the front panel.

• Uses ABB TU515 or TU516 terminal units in a supported AC500 S500 configuration.
• Field commons and supply distribution must suit the one-wire connection concept.
• Output grouping, total current and process-supply protection must be engineered for the connected loads.
• Counter devices must be assigned to C16 and C17, with C18 used when the counter output is required.
• The standard DC523 article and DC523-XC environmental version are not the same ordering item.

• Confirm article 1SAP240500R0001 and the 24-channel one-wire design before ordering.
• Record each channel direction, input delay and counter assignment in the installed application.
• Preserve the process image and diagnostic mapping from the controller project.
• Check the terminal unit and common-potential wiring before exchanging the electronics.
• Test all 24 points and the counter function after the replacement is commissioned.

How many points can DC523 configure?

DC523 provides 24 channels that can be assigned as digital inputs or outputs.

Why is DC523 described as a one-wire module?

Its field connection arrangement is designed for one-wire signal distribution, unlike the two-wire DC522 configuration.

Can the input response be adjusted?

Yes. ABB documents a typical 8 ms input delay with a configurable range from 0.1 to 32 ms.

Where is the fast-counter function connected?

C16 and C17 are the counter inputs, and C18 is the associated output.

Which digital-input standard is specified?

The inputs are documented as EN 61131-2 Type 1.

What should be compared when choosing between DC522 and DC523?

Compare channel count, one-wire versus two-wire field connection, counter-channel assignments and the existing terminal wiring.