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Revolution Today

Digital I/O module RevPi DIO with 14 inputs and outputs

Digital I/O modules

To transform Revolution

Pi into an industrial con-

trol unit, various digital I/O

modules, amongst other

things, can be connected

to the base module RevPi

Core.

he I/O modules come

in three versions. All

have the same 28-

pin I/O connector at

the front (connector

with two rows of 14 pins each

– two suitable 14-pin socket

connectors with spring clamp

contacts for the connection of

up to 1.5 mm² stranded hook-

up wires are supplied). Apart

from the standard version with

14 digital inputs and 14 digi-

tal outputs, there are also two

special versions that exclusively

have either 16 digital inputs or

16 digital outputs. In all three

variants, the inputs or outputs

are galvanically isolated from

the logic component with the

PiBridge (600 VRMS isolati-

on voltage). In the standard

version, the inputs are also

galvanically isolated from the

outputs. All three versions are

protected against disturbances

according to EN61131-2 and

can be operated between -40

and +50°C ambient tempera-

ture and up to 80% relative

humidity. The standard ver-

sion of the module is also

tted with PWM outputs (pulse

width modulation) and counter

inputs.

The inputs work at 24 V sup-

ply with switching thresholds,

as required by the EN61131-2

standard for type 1 and type 3.

The input current is limited to

a maximum of 2.4 mA per in-

put. At 12 V power supply, this

standard no longer takes ef-

fect. If the power supply volta-

ge should discontinue and fall

below 9 V, an alarm is sent au-

tomatically to RevPi Core to in-

dicate that the transmitted in-

put values no longer match the

reliable threshold values as laid

down in the standard accor-

ding to 24 V switching logic. An

adjustable low-pass filter can

be used for debouncing input

signals. It can always only be

switched on simultaneously for

all inputs. The lter only pas-

ses on input changes if an in-

put assumes a stable state for

at least 25 µs, 750 µs or 3 ms.

The lter can also be switched

o completely. Inputs are pro-

tected against static dischar-

ges, burst and surge impulses

in accordance with EN61131-2

requirements.

Each of the outputs can be

configured separately as a

high-side-switch with up to 500

mA current carrying capacity

or as push-pull-output with at

least 100 mA current load ca-

pacity. All outputs are short-cir-

cuit proof independent of the

operating mode. A watch-dog

circuit ensures that the outputs

are set to 0 (safe state), once

the STM processor no longer

transmits any data from the

PiBridge to the outputs. The

outputs are set to 0 also in the

event of undervoltage at the

Available for all common industrial network protocols, the RevPi

Gates help to integrate Revolution Pi into an industrial network

It is not easy at all to integrate a device into an indus-

trial network. Special protocols are often used for

data transmission, such as Proﬁnet or Proﬁbus. When

using our gateways - called RevPi Gate - integrating

Revolution Pi into an industrial network is however no

problem.

ike all Revolution Pi expansion modules, the gateways

are also connected to the base module via the over-

head PiBridge connector. Thus, up to two gateway mo-

dules can be used per system. These, like all modules,

are supplied with 24 volts that is the norm within the

industry.

We have currently set the cycle time between the base modu-

le and a gateway to 5 ms by means of drivers. Though the gate-

way modules could reach cycle times of less than 2 ms, it would

burden the system load of the base module disproportionately.

For, the lower the cycle times set in the driver, the greater the

system load is of the device that has to be expended for this

process.

We currently oer gateways for the network

protocols shown below. All module variants have been

tested and certied at the respective user organisations:

Fieldbus

connection

power supply connection for

the outputs or in the case of

overtemperature. These last

two error states as well as the

triggering of the short circuit

fuse per channel are trans-

mitted to RevPi Core via the

PiBridge.

In addition, the outputs can

be congured so that an open

load detection (line break) is

also switched on and a corres-

ponding alarm is transmitted

to the RevPi Core for high-side

output type. Just like the in-

puts, the outputs are also pro-

tected against static dischar-

ges, burst and surge impulses

in accordance with EN61131-2

requirements.

Analog I/O - module

Expand Revolution Pi by using

the analog IO module RevPi AIO.

You can expand your system

not only by 4 analog inputs and

2 analog outputs but also by 2

inputs for RTDs.

The 2 RTD inputs enable

temperatures to be measured

with high precision from -165°C

to +600°C in steps of 0.5°C

using common RTDs sensors

like Pt100/Pt1000 probes. The

probes can be connected direct-

ly to the module with 2, 3 or 4

cables.

Inputs, RTD inputs and outputs

are galvanically isolated to each

other. Dierential inputs elimi-

nate ground loops.

RevPi AIO expansion module

is connected to your RevPi base

module by the means of the

overhead PiBridge plug.

Just like the digital IO mo-

dules, RevPi AIO is protected

against disturbances according

to EN61131-2 and can be ope-

rated between -40 and +50°C

ambient temperature and up to

80% relative humidity. It is also

protected against static dischar-

ges, burst and surge impulses in

accordance with EN61131-2 re-

quirements.

RevPi Core 3 and RevPi AIO on DIN rail