Chapter 7 I/O modules MASTER-K
7-1
7 I/O modules
7.1 Notes on selecting I/O modules
When selects I/O module for K200S/300S/1000S PLC system, please refer the following
instructions.
1) The digital input module is classified as current sink input and current source input. The
external wiring with input device is various according to the type of digital input module.
Please select suitable digital input module type with considering of specification of input
device.
2) The maximum points that can be turn simultaneously on differ with each module. Before
to select a digital I/O module, check the specification of module.
3) When a very fast response time (less than a scan time) is required, select an interrupt
module. However, only one interrupt module can be mounted on a system.
4) The lifetime of relay is described as total on/off times (No load : 10 million times, With
load : 0.1 ~ 3 million times). Therefore, if the frequency of on/off operation of relay is
higher, the lifetime of relay is shorter. Please use transistor or SSR output module for high
frequency operation.
5) When a large and/or inductive load is connected directly to the output module, it may
cause malfunction of the output module. It is highly recommended customers to connect
an external relay or SSR between an output module and large inductive load for improved
reliability and maintenance of PLC system.
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