Profibus-DP Hollow Shaft Absolute Encoder SAS/M90

Large through-bore design with fieldbus output simplifies installation and system integration. High-precision optical sensing technology supports both single-turn and multi-turn absolute position measurement. Single-turn resolution is available up to 16 bit, with standard multi-turn resolution up to 14 bit. PROFIBUS-DP communication is supported, with higher multi-turn capacity available as a custom option. Excellent resistance to magnetic interference, combined with protection ratings up to IP66, ensures reliable operation in demanding industrial environments. Built-in reverse polarity and short-circuit protection helps reduce the risk of encoder damage caused by incorrect wiring.

Product Specifications

Product Series	SAS/M90A
Shaft Type	Ø90 mm, Hollow Shaft
Shaft Diameter	Ø10–28 mm
Housing Material	Aluminum (Stainless steel housing optional)
Communication Interface	PROFIBUS-DP
DP-V0 Functions	MS0, Freeze, Sync, Auto_Baud, Fail_Safe
Output Circuit	RS485-compliant line driver, optically isolated
Function	Single-turn or Multi-turn
Supply Voltage	10–30 VDC
Single-turn Resolution	16 bit / 65536; 25 bit / 33554432
Number of Revolutions	1 revolution (single-turn); 16384 revolutions / 14 bit
Power Consumption	≤1 W
Programmable Functions	Resolution, speed unit, preset (zero position), counting direction, limit switches
Transmission Rate	≤12 Mbit/s
Manual Settings	Address selector 0–99 and termination resistor switch (with terminal box)
Reverse Polarity Protection	Yes
Short-circuit Protection	Yes
Surge and ESD Protection	Yes
Operating Speed	6000 rpm
Shaft Load	Radial: 200 N; Axial: 100 N
Degree of Protection	IP65
Starting Torque	<0.05 Nm
Operating Temperature	-40°C to +85°C
Storage Temperature	-40°C to +100°C
Shock Resistance	1000 m/s², 6 ms (100 g)
Vibration Resistance	20 g
Electrical Connection	3 × PG9 cable glands
Connection Direction	Radial

Terminal Assignment

Signal	Definition
⊥	Protective ground
B (Left)	Data line B (input)
A (Left)	Data line A (input)
(-)	0 V
(+)	10–30 V
B (Right)	Data line B (output)
A (Right)	Data line A (output)
(-)	0 V
(+)	10–30 V
	The power supply only needs to be connected once, regardless of which terminal group is used. When the termination resistor is enabled, the output is disconnected.

LED Indicators

Red LED	Green LED	Status Information / Possible Cause
Off	Off	No power supply
On	Flashing	Encoder ready, but no configuration data has been received after power-up. Possible causes: Incorrect encoder address setting; encoder hardware type mismatch.
Flashing	On	Encoder is operating normally, but master lock has not been completed or valid configuration parameters have not been received.
On	Off	No data has been received from any master for a certain period of time. Possible cause: Communication bus disconnected.
Off	On	Normal data exchange

LED Indicators and Operating Principle

Slave Address Setting:

The slave address can be set using two rotary switches. The address range is 1–99, and each address may only be used once on the bus.

Termination Resistor Setting:

The termination resistor RT can be connected to the bus using the switch.

SAS/M90A