TwinSAFE SC: Incremental encoder interface EL5101-0090
Power 5 V
Latch, gate 
Run LED 
Input C, 1 
Input A, B 
Power contact
+24 V
Power contact 0 V
Input A, A
Input B, B
Input C, C
Latch, gate
Encoder
supply UE, U0
+24 V (2x)
0 V (2x)
Shield, Input 1
Top view 
Contact assembly 
extended temperature range
extended shock and vibration range

EL5101-0090 | TwinSAFE SC: Incremental encoder interface

The EL5101-0090 EtherCAT Terminal allows direct connection of incremental encoders with differential inputs (RS422). A 32/16 bit counter with a quadrature decoder and a 32/16 bit latch for the zero pulse can be read, set or enabled. Interval or frequency measurement are possible. The gate input allows the counter to be halted. The counter state is taken over with a rising edge at the latch input.

With the aid of the TwinSAFE SC technology (TwinSAFE Single Channel) it is possible to make use of standard signals for safety tasks in any network or fieldbus. The standard functions and features of the I/Os remain available. The data from these TwinSAFE SC I/Os is fed to the TwinSAFE Logic, where they undergo safety-related multi-channel processing. In the Safety Logic the data originating from different sources is analysed, checked for plausibility and submitted to a “voting”. This is done by certified function blocks such as Scale, Compare/Voting (1oo2, 2oo3, 3oo5), Limit, etc. For safety reasons, however, at least one of the data sources must be a TwinSAFE SC component. The remainder of the data can originate from other standard Bus Terminals, drive controllers or measuring transducers.

With the aid of the TwinSAFE SC technology it is typically possible to achieve a safety level equivalent to PL d/Cat. 3 in accordance with EN ISO 13849-1 or SIL 2 in accordance with EN 62061.

Technical data EL5101-0090
Technology incremental encoder interface RS422
Encoder type Incremental, differential (RS422)
Number of channels 1
Encoder connection A, A (inv), B, B (inv), C,C (inv), differential inputs (RS422); status input 5 V DC; gate/latch input 24 V DC
Encoder operating voltage 5 V DC/max. 0.5 A
Encoder output current 0.5 A
Counter 1 x 16/32 bit switchable
Input frequency max. 4 million increments/s (with 4-fold evaluation)
Quadrature decoder 4-fold evaluation
Zero-pulse latch 32 or 16 bits
Commands read, set, enable
Input signal difference signal (RS422), single-ended possible
Supply voltage 24 V DC (-15 %/+20 %)
Nominal voltage 24 V DC at power contact
Resolution 1/256 bit microincrements
Bit width in the process image 1 x 32 bit input, 1 x 16 bit output, 8 bit control, 8 bit status
Current consumption power contacts typ. 100 mA + load
Current consumption E-bus typ. 130 mA
Distributed clocks yes
Special features TwinSAFE SC, wire breakage detection, latch and gate function, period duration and frequency measurement, microincrements, time-stamping of edges, filters
Weight approx. 100 g
Operating/storage temperature -25…+60 °C/-40…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Approvals CE, UL, Ex
Further information
TwinSAFE SC TwinSAFE SC technology
Related products  
EK1960 TwinSAFE Compact Controller
EL6910 TwinSAFE Logic