Hardware

Connection

Symbol	Function
24V	Power supply +24 VDC / @1.5 A
0V	Power supply 0 VDC
W1 W2	Watchdog relay output
1	CAN High (CODESYS CAN0)
3	CAN Low (CODESYS CAN0)
2	RS485 TX+ (CODESYS COM3)
4	RS485 RX− (CODESYS COM3)
USB	USB Host — external memory or CODESYS License Dongle Key
S1-2	Switch — CAN 120 Ω termination (ON = closed)
S2-1	Switch — RS485 120 Ω termination (ON = closed)
ETH1	Ethernet — real-time
ETH0	Ethernet
X2	Ethernet local bus ET1100 EtherCAT

Caution

For EtherCAT or any real-time communication, connect slave devices to ETH1.

---

Power Supply

Input: +16 Vdc to +28 Vdc.

Pin	Signal	Min	Nominal	Max
24V	+V	16 V	24 V	28 V
0V	GND	—	—	—

---

Front LED

Color	Meaning
White	Booting OS
Yellow	CODESYS application STOP or not loaded
Green	CODESYS application RUN
Red	CODESYS application EXCEPTION
Off	No power

---

Retentive Memory

Variables declared RETAIN are automatically saved to micro UPS-backed memory. Maximum: 128 kB.

(* In a POU *)
VAR RETAIN
    iCounter : INT;
END_VAR

(* In GVL *)
VAR_GLOBAL RETAIN
    gvarRem1 : INT;
END_VAR

The micro UPS automatically saves retain data when input voltage drops below 16 VDC. The front LED turns off during this process to conserve power.