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imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19

63Hardware configuration of all devices

5.1.1.1.2 Sampling interval and brief signal levels

The digital inputs can be recorded in the manner of an analog channel. It isn’t possible to select individual

bits for acquisition; all 16 bits (digital port) are always recorded. The hardware ensures that the brief

HIGH level within one sampling interval can be recognized.

input signal

sampling

inc. memory

recorded signal

5.1.1.2 Digital outputs

The digital outputs DO_01..08 provide galvanically isolated control signals with current driving capability

whose values (states) are derived from operations performed on measurement channels using imc

Online FAMOS. This makes it easily possible to define control functions.

The technical specification of the digital outputs .

The pin configuration of the ACC/DSUBM-DO8 .

Important notes

available levels: 5 V (internal) or up to 30 V with external power supply

current driving capability:

HIGH: 15 mA to 22 mA LOW: 700 mA

short-circuit-proof to supply or to reference potential HCOM and LCOM

configurable as open-drain driver (e.g. as relay driver)

default-state at system power-on:

HIGH (Totem-Pole mode) or high-impedance (Open-Drain mode)

The eight outputs are galvanically isolated as a group from the rest of the system and are designed

as Totem-Pole drivers. The eight stages' ground references are connected and are accessible as a

signal at LCOM.

HCOM represents the supply voltage of the driver stage. It is generated internally with a galvanically

isolated 5 V-source (max. 1 W). Alternatively, an external higher supply voltage can be connected (max.

+30 V), which then determines the drivers' output level.

The control signal OPDRN on the DSUB plug can be used to set the driver type for the corresponding 8-

bit-group: either Totem-Pole or Open-Drain :

In Totem-Pole mode, the driver delivers current in the HIGH-state. In the Open-Drain configuration,

conversely, it has high impedance in the HIGH-state, in LOW-state, an internally (HCOM) or externally

supplied load (e.g. relay) is pulled down to LCOM (Low-Side Switch). With Open-Drain mode, the external

supply driving the load, need not be connected to HCOM but only to the load.

Inductive loads (relays, motors) should be equipped with a clamp diode in parallel for shorting out

switch-off transients (anode to output, cathode to positive supply voltage).

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IMC C SERIES User Manual

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