OMRON CK3W-AX Multi axis Control Selection

2.3 Universal I/O Polarity

NPN type: Input common terminal is 0V, output is low level effective. Suitable for commonly used logic in Japanese PLCs.

PNP type: Input common terminal is 24V, output is high level effective. Suitable for European and American control habits.

Engineering suggestion: When selecting, it is necessary to confirm the type of command signal received by the servo drive and the type of encoder feedback. If using a third-party servo, pay attention to signal level matching (differential/single ended) and voltage range.

System configuration and rack installation

The CK3W-AX unit must be used on the rack of the CK3M/CK5M motion controller. The system consists of a CPU rack and an optional expansion rack.

3.1 CPU Rack Configuration

The CPU rack shall at least include: power unit, CPU unit End Cover。 On the right side of the CPU unit, it can be connected in sequence:

Up to 4 CK3W units (but up to 2 CK3W-AX units, the rest can be MD/AD/ECS/GC, etc.).

To connect the expansion rack, the expansion main unit CK3W-EXM01 must be installed adjacent to the right side of the CPU unit before connecting other units.

If the extended main unit is not adjacent to the right side of the CPU unit, the CK3WConfigErr in the Sys. Status register will display error code "5".

3.2 Expansion Rack Configuration (CK5M/CK3M)

CK5M CPU supports up to 3 expansion racks; The CK3M CPU supports up to one expansion rack.

Each expansion rack requires a power unit, as well as an expansion slave unit located immediately to the right of the power unit:

The extension in the middle position uses CK5W-EXS01 from the unit (only supported by CK5M).

The farthest (last) expansion rack uses CK3W-EXS02.

Use a dedicated extension cable CK3W-CAX003A (30 cm) to connect the expansion master unit and the expansion slave unit.

Attention: The CPU rack and expansion rack must be powered by the same 24V power supply to avoid communication abnormalities caused by potential differences.

3.3 Unit Installation and Address Setting

Each CK3W-AX unit has an address switch (0-F) on the front panel for setting the Gate3 index. In the IDE of Power PMAC, this address will be used to access the register mapping of the axis interface. Within the same rack, the addresses of each unit must be unique.

Detailed explanation of dedicated cables and wiring

To ensure signal integrity, OMRON provides various specialized shielded cables for CK3W-AX units, with lengths mostly up to 3 meters (some options include 0.9/1.8/3.6 meters). It is not recommended to make cables by oneself, as differential signals have strict matching requirements for impedance and shielding structures.

4.1 Encoder side cable

Encoder type, cable model, length description

Digital orthogonal encoder CK3W-CAED03A 3 m supports A/B/Z differential and end scatter

Sine encoder CK3W-CAEA03A 3 m SIN/COS/INDEX, end scattered line

Serial encoder CK3W-CAES03A 3 m CLK/DAT differential, end scattered

Digital orthogonal+UVW/serial CK3W-CAEW03A 3-meter two cable combination (see manual line sequence)

Sine+UVW/Serial CK3W-CAEAW03A 3 m Two Cable Combination

Wiring points:

All cable shielding layers are connected to the outer casing (FG) of the encoder connector. For sine encoder cables, there is also a twisted pair shielding layer connected to the encoder power GND pin.

When connecting G5 series servo drives, specific pins (such as 1-5, 6-10) need to be short circuited to disable the serial DAT terminal resistor, and OutFlagD=1.

The encoder power supply (5V) has a maximum of 500 mA per channel, and the total output of the entire unit is ≤ 1 A. If the encoder current requirement is high, an external power supply should be considered.

4.2 Amplifier side cable

4.2.1 Analog output type (AX1414/AX1515)

Use CK3W-CAA03A (3m) cable with loose ends. The signals include:

Analog output A+/- (DACA), analog output B+/- (DACB, only valid for AX1515)

Pulse output+/- (PULSE)

Directional output+/- (DIR)

Fault input

Amplifier Enable NO/NC and Common Terminal

Wiring suggestion: Connect the analog output "analog GND" to the signal ground of the servo driver at a single point; It is recommended to use shielded twisted pair cables for pulse/direction signals.

4.2.2 DirectPWM type (AX1313/AX2323)

For OMRON CK3A-G3L intelligent servo, it is recommended to use one touch installation cable:

200‑602739‑036x（0.9 m）

200‑602739‑072x（1.8 m）

200‑602739‑144x（3.6 m）

For other brands of servos, screw fixed cables can be used:

CK3W‑CAAD009A（0.9 m）

CK3W‑CAAD018A（1.8 m）

CK3W‑CAAD036A（3.6 m）

The signals transmitted by DirectPWM cables include PWM+/-, directional signals, encoder feedback (some models), etc. Specific pin allocation should refer to the servo driver manual.

Engineering Tip: When using DirectPWM mode, be sure to confirm that the input circuit of the servo driver can accept 5V differential PWM signals and correctly set the terminal resistance.

Flag signal and universal I/O

5.1 Each axis flag signal (connected through Flag terminal block)

Each channel provides the following dedicated signals:

HOME: Origin input (normally open, configurable)

PLIM: Positive limit input

NLIM: Negative limit input

User: User defined input (can be used for emergency stop, zeroing completion, etc.)