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I

Identifier
Address of a message in a CAN network.

IEC
International Electrotechnical Commission; organization promoting international standardization of electrical components.

Immunity to interference
Test procedure according to IEC 801, Part 4 – A test of susceptibility to fast electrical transients (bursts) causing interference on lines. The test values are divided into 5 levels:

Level	Mains line	Data and control lines
1	0.5 kV	0.25 kV
2	1.0 kV	0.5 kV
3	2.0 kV	1.0 kV
4	4.0 kV	2.0 kV
X	special	special

Immunity to interference (continued)
– Test procedure according to IEC 801, Part 2 Discharge of static electricity on the surface and in the surroundings of the specimen. The test values are divided into 4 classes:

Class	test voltage
1	2 kV
2	4 kV
3	8 kV
4	15 kV

– Radio interference voltage test to VDE 0871.

Increment mode
See operating mode

Incremental measuring system
Measuring method in which the variable is formed by counting increments (measuring steps).

Incremental shaft encoder
Shaft encoder which transmits an electrical signal (yes/no) for each increment, determined by the marked disc.

INH
Inhibit; see inhibit

Inhibit
Blocking of counter input during counting operation.

Integer
Integral values; range of values at n bit: 0 … (2n-1)

Integrated coupling
Flexible coupling built into shaft encoders

INTERBUS
Real time bus for the sensor-actor-level

Interbus-Loop
Two wire version of Interbus, transmitting data over the power supply lines and using Phoenix Contact "Quickon" cable plugs.

Interface
Transfer point with certain terminals, signals, or signal sequences. The interface serves for communication of the shaft encoder with other systems.

Interface (Counter)
The interface is used for communication between counter and external systems. Counter values can be input or output via the interface.

Interference immunity
Testing procedure according to IEC 801 Section 4
- Test for interference immunity against bursts (coupling to lines)
The test values are divided into 5 steps: Stage Power lines Data and control lines
1 0.5 kV 0.25 kV
2 1.0 kV 0.5 kV
3 2.0 kV 1.0 kV
4 4.0 kV 2.0 kV
X special special
Test procedure according to IEC 801, Section 2
- Electrostatic discharge on the surface and surroundings of the test object.
The test values are divided into 4 classes:
Class Test voltage
1 2 kV
2 4 kV
3 8 kV
4 15 kV
– Radio interference according to VDE 0871

Input
Count input

Inspection certificate
All Hengstler products are subjected to strict quality inspection, the results of which can be attested by an inspection certificate according to DIN 55 350-18-4.1.1.

Interpolation
Scanning of a sinewave signal to increase resolution by generating intermediate position values.

IP
See "Protection class"