Expansion Blocks Description

Introduction

There are two main types of TM7 expansion blocks:

Both the TM7 Power Distribution Blocks and TM7 Safety-Related System I/O blocks use two power buses and a data bus to perform their functions. These buses are organized as follows:

  • TM7 bus: this bus includes one data bus and one power bus, named as follows:

    • TM7 power bus: distributes power to supply the electronics of the TM7 Safety-Related System I/O blocks. This bus receives its power from a TM5SBET7 Transmitter module. If necessary, the power on the TM7 power bus can be reinforced by adding a TM7 PDB.

    • TM7 data bus: passes data between the Sercos III Bus Interface and the TM7 expansion blocks.

  • 24 Vdc I/O power segment: distributes power to the inputs, outputs and the connected sensors and actuators of the TM7 Safety-Related System I/O blocks. Each TM5 / TM7 Safety-Related System can have multiple 24 Vdc I/O power segments, depending on considerations such as power consumption and separation of I/O types.

Ordering Information

Each I/O block reference is distinguished by its type and number of I/O and its physical size. TM7 Safety-Related System I/O blocks come in two sizes.

Reference

Description

Refer to

TM7SDM12DTFS

Mixed input and output block for safety-related applications

Modicon TM5/TM7 Digital I/O Safety Modules Hardware Guide

TM7SDI8DFS

Digital input block for safety-related applications

TM7 cables have to be ordered separately.

I/O Block Main Features

The following figure represents the main features of the I/O blocks:

Size 1

Size 2

(A) TM7 bus IN connector

(B) TM7 bus OUT connector

(C) 24 Vdc power IN connector

(D) 24 Vdc power OUT connector

(1) Input / Output connectors (depending on reference)

(2) Status LEDs

NOTE: For more information on the pinouts of these various connectors, see Modicon TM5/TM7 I/O Safety Modules Hardware Guide.