Supported registers

This page lists device families supported by the high-level API.

The high-level string parser accepts plain device strings only. The examples below are address syntax examples, not guaranteed range limits for every PLC model.

Bit device families

Family	Kind	Example address	Notes
X	Input relay	X10	Hexadecimal address.
Y	Output relay	Y10	Hexadecimal address.
M	Internal relay	M100	Decimal address.
L	Latch relay	L100	Decimal address.
SM	Special relay	SM100	Decimal address.
F	Annunciator	F100	Decimal address.
V	Edge relay	V100	Decimal address.
B	Link relay	B100	Hexadecimal address.
TS, TC	Timer contact / coil	TS0	Decimal address.
STS, STC	Retentive timer contact / coil	STS0	Decimal address.
CS, CC	Counter contact / coil	CS0	Decimal address.
SB	Link special relay	SB100	Hexadecimal address.
S	Step relay	S100	Decimal address.
DX, DY	Direct access input/output	DX10	Hexadecimal address.
LTS, LTC	Long timer contact / coil	LTS0	Decimal address.
LSTS, LSTC	Long retentive timer contact / coil	LSTS0	Decimal address.
LCS, LCC	Long counter contact / coil	LCS0	Decimal address.

Word device families

Family	Kind	Example address	Notes
D	Data register	D100	Decimal address.
SD	Special register	SD100	Decimal address.
W	Link register	W100	Hexadecimal address.
TN	Timer current value	TN0	Decimal address.
STN	Retentive timer current value	STN0	Decimal address.
CN	Counter current value	CN0	Decimal address.
SW	Link special register	SW100	Hexadecimal address.
LTN	Long timer current value	LTN0	Decimal address; treated as double-word in random helpers by default.
LSTN	Long retentive timer current value	LSTN0	Decimal address; treated as double-word in random helpers by default.
LCN	Long counter current value	LCN0	Decimal address; treated as double-word in random helpers by default.
LZ	Long index register	LZ0	Decimal address; treated as double-word in random helpers by default.
Z	Index register	Z0	Decimal address.
R	File register	R0	Decimal address.
RD	Module access register	RD0	Decimal address.
ZR	File register	ZR0	Decimal address.

Addressing notes

Topic	Current behavior
Plain device string	Supported. Use forms such as D100, M100, X10, W100, LZ0.
Hexadecimal address families	X, Y, B, W, SB, SW, DX, and DY parse their numeric part as hexadecimal.
:D / :F suffix	Not supported by the current high-level parser. Use typed C++ fields such as double_word where available.
.n bit-in-word suffix	Not supported by the current high-level parser.
Long timer/counter restrictions	Some random and multi-block operations reject long contact/coil devices. Check Status and use simpler contiguous operations first.

Profile-specific range limits depend on the PLC family and serial module. See PROFILES.md before choosing the final profile for a live system.