Supported registers

This page lists the high-level string device families accepted by the public helper layer.

Bit device families

Device	Meaning	Numbering	Notes
SM	Special relay	Decimal	System bit device.
X	Input	Profile-aware	iQ-F uses octal notation; other profiles use hexadecimal notation.
Y	Output	Profile-aware	iQ-F uses octal notation; other profiles use hexadecimal notation.
M	Internal relay	Decimal	General internal bit device.
L	Latch relay	Decimal	Latched bit device.
F	Annunciator	Decimal	Alarm or annunciator bit device.
V	Edge relay	Decimal	Not supported by every PLC profile.
B	Link relay	Hexadecimal	Link bit device.
TS	Timer contact	Decimal	Standard timer contact.
TC	Timer coil	Decimal	Standard timer coil.
LTS	Long timer contact	Decimal	State device; writes are routed through random bit write.
LTC	Long timer coil	Decimal	State device; writes are routed through random bit write.
STS	Retentive timer contact	Decimal	Retentive timer contact.
STC	Retentive timer coil	Decimal	Retentive timer coil.
LSTS	Long retentive timer contact	Decimal	State device; writes are routed through random bit write.
LSTC	Long retentive timer coil	Decimal	State device; writes are routed through random bit write.
CS	Counter contact	Decimal	Standard counter contact.
CC	Counter coil	Decimal	Standard counter coil.
LCS	Long counter contact	Decimal	Direct bit read; writes are routed through random bit write.
LCC	Long counter coil	Decimal	Direct bit read; writes are routed through random bit write.
SB	Link special relay	Hexadecimal	Link special bit device.
DX	Direct input	Hexadecimal	Not valid for SlmpPlcProfile.IqF.
DY	Direct output	Hexadecimal	Not valid for SlmpPlcProfile.IqF.

Word device families

Device	Meaning	Numbering	Notes
SD	Special register	Decimal	System word device.
D	Data register	Decimal	Recommended first smoke-test word family.
W	Link register	Hexadecimal	Link word device.
TN	Timer current value	Decimal	Standard timer current value.
LTN	Long timer current value	Decimal	32-bit family; use :D or :L.
STN	Retentive timer current value	Decimal	Retentive timer current value.
LSTN	Long retentive timer current value	Decimal	32-bit family; use :D or :L.
CN	Counter current value	Decimal	Standard counter current value.
LCN	Long counter current value	Decimal	32-bit family; use :D or :L.
SW	Link special register	Hexadecimal	Link special word device.
Z	Index register	Decimal	16-bit index register.
LZ	Long index register	Decimal	32-bit family; use :D or :L.
R	File register	Decimal	File register.
ZR	File register continuous	Decimal	Continuous file register; the device-range catalog reports it unsupported for SlmpPlcProfile.IqF.
RD	Refresh data register	Decimal	The device-range catalog reports it unsupported for SlmpPlcProfile.IqF, SlmpPlcProfile.QCpu, SlmpPlcProfile.LCpu, SlmpPlcProfile.QnU, and SlmpPlcProfile.QnUDV.

Type suffixes

Suffix	Meaning	.NET value	Size
Plain word	D100	ushort	1 word
:U	Unsigned 16-bit	ushort	1 word
:S	Signed 16-bit	short	1 word
:D	Unsigned 32-bit	uint	2 words
:L	Signed 32-bit	int	2 words
:F	Float32	float	2 words
.n	Bit inside word	bool	1 bit from one word

Addressing notes

Topic	Rule
Long 32-bit families	LTN, LSTN, LCN, and LZ require :D or :L; plain word access is rejected.
iQ-F direct devices	DX and DY are not valid for SlmpPlcProfile.IqF.
Module buffer devices	G and HG are not in the public high-level surface. Use low-level raw client methods for module buffer access.
Bit-in-word syntax	.n is valid only on word devices, for example D50.3. Address bit devices directly, for example M1000.
Profile-aware X and Y	Use a connected client or SlmpAddress.Parse(text, profile) so iQ-F octal rules are applied.

See PLC profiles for canonical profiles and frame modes.