Fatek

The Fatek protocol provides communication with Fatek Automation’s FBs and FBe series PLCs over Ethernet. inSCADA supports the Fatek protocol with TCP and UDP transport layers in Client role only.

Supported Variants

Variant	Description
Fatek TCP	Fatek communication over TCP/IP
Fatek UDP	Fatek communication over UDP

Data Model

Connection (IP, port)
└── Device (Station Address)
    └── Frame (Data Block — Register area)
        └── Variable (Register address)

Configuration

Connection

Parameter	Example	Description
Protocol	Fatek TCP or Fatek UDP	Protocol selection
IP Address	192.168.1.10	PLC IP address
Port	500	Fatek Ethernet port (default: 500)
Timeout	5000 ms	Request timeout duration

Device

Parameter	Example	Description
Station Address	1	PLC station number (1-254)
Scan Time	1000 ms	Scan period
Scan Type	PERIODIC	PERIODIC or FIXED_DELAY

Frame

Parameter	Example	Description
Type	D	Register area type (see below)
Start Address	0	Starting register address
Quantity	50	Number of registers/bits to read

Register Areas (Frame Types)

Fatek PLCs have multiple memory areas. These areas are divided into two main categories: discrete (bit) and register (word).

Discrete (Bit) Areas:

Type	Description	Access
X	Digital input (Input)	Read-only
Y	Digital output (Output)	Read/Write
M	Internal relay	Read/Write
S	Step relay	Read/Write
T	Timer contact	Read-only
C	Counter contact	Read-only

Word (16-bit) Register Areas:

Type	Description	Access
WX	Input word register	Read-only
WY	Output word register	Read/Write
WM	Internal relay word register	Read/Write
WS	Step relay word register	Read/Write
WT	Timer current value (16-bit)	Read-only
WC	Counter current value (16-bit)	Read-only
RT	Timer preset value (16-bit)	Read/Write
RC	Counter preset value (16-bit)	Read/Write
R	Data register (16-bit)	Read/Write
D	Data register (16-bit)	Read/Write
F	File register (16-bit)	Read/Write

Double Word (32-bit) Register Areas:

Type	Description	Access
DWX	Input double word	Read-only
DWY	Output double word	Read/Write
DWM	Internal relay double word	Read/Write
DWS	Step relay double word	Read/Write
DWT	Timer current value (32-bit)	Read-only
DWC	Counter current value (32-bit)	Read-only
DRT	Timer preset value (32-bit)	Read/Write
DRC	Counter preset value (32-bit)	Read/Write
DR	Data register (32-bit)	Read/Write
DD	Data register (32-bit)	Read/Write
DF	File register (32-bit)	Read/Write

Tip

Most common usage: X, Y, M for discrete I/O; D or R registers for data storage; DD or DR for 32-bit values.

Variable

Parameter	Example	Description
Start Address	0	Register offset within the frame
Type	FLOAT	Data type

Supported Data Types

Data Type	Size	Description
BOOL	1 bit	Discrete (bit) value
INT16	16 bit	Signed 16-bit integer
UINT16	16 bit	Unsigned 16-bit integer
INT32	32 bit	Signed 32-bit integer
UINT32	32 bit	Unsigned 32-bit integer
FLOAT	32 bit	32-bit floating point (IEEE 754)

Address Calculation Example

Frame: D register, Start Address: 0, Quantity: 20

Variable examples:
├── D0    → Start: 0, Type: INT16    (first data register)
├── D1    → Start: 1, Type: UINT16   (second data register)
├── D2-3  → Start: 2, Type: FLOAT    (32-bit float, occupies 2 registers)
├── D4-5  → Start: 4, Type: INT32    (32-bit integer, occupies 2 registers)
└── D10   → Start: 10, Type: INT16

Frame: M relay, Start Address: 0, Quantity: 32

Variable examples:
├── M0    → Start: 0, Type: BOOL     (first internal relay)
├── M1    → Start: 1, Type: BOOL     (second internal relay)
└── M16   → Start: 16, Type: BOOL

TCP vs UDP Selection

Feature	Fatek TCP	Fatek UDP
Reliability	High (guaranteed delivery)	Low (packet loss possible)
Latency	Normal	Low
Usage	General purpose (recommended)	Low-latency requirements

Note

Fatek TCP should be preferred for most applications. UDP should only be used in cases with special performance requirements.