2.3Hardware Installation
2.3.1Selecting I/O Module
To organize an
What type of I/O signal is applied in your system?
How many I/O is required to your system?
How will you concentrate the I/O points of an entire process?
What is the required voltage range for each I/O module?
What isolation environment is required for each I/O module?
What are the noise and distance limitations for each I/O module?
Refer to discrete & analog I/O module selection guidelines as below.
Table 2.1: Discrete and Analog I/O Selection Guidelines
Choose this type of I/O | For these types of field devices or | Explanation: | |
module: | operations (examples): | ||
| |||
| Selector switches, push buttons, | Input modules sense ON/OFF | |
| photoelectric eyes, limit switches, | ||
Discrete input module | circuit breakers, proximity switches, | or OPENED/CLOSED sig- | |
and block I/O module | level switches, motor starter con- | nals. Discrete signals can be | |
| tacts, relay contacts, thumbwheel | either AC or DC. | |
| switches |
| |
|
| Output module signals inter- | |
Discrete output module | Alarms, control relays, fans, lights, | face with ON/OFF or | |
horns, valves, motor starters, sole- | OPENED/CLOSED devices. | ||
and block I/O module | noids | Discrete signals can be either | |
| |||
|
| AC or DC. | |
| Thermocouple signals, RTD signals, |
| |
| temperature transducers, pressure | Convert continuous analog | |
Analog input module | transducers, load cell transducers, | ||
signals into input values | |||
| humidity transducers, flow transduc- | ||
| ers, potentiometers. |
| |
| Analog valves, actuators, chart | Interpret output value to ana- | |
Analog output module | recorders, electric motor drives, | log signals (generally through | |
| analog meters | transducers) for field devices. |
Advantech provides 28 types of
Chapter 2 Installation
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