Process connection systems

This catalog is out of date, see note on page 1

Automation systems

Process signal cables, information on cable routing The process signal cables should be screened installation cables for industrial electronics with color-coded conductors twisted in pairs and combined into bundles.

Highly suitable are SIMATIC cables with a conductor cross-sec- tion of 0,5 mm² (conductor diameter 0.8 mm). In these cables,

8 pairs of twisted conductors, each identified by different colors, are combined into a bundle. The conductors of each bundle have a special ring identification in order to differentiate the bun- dles.

Process cables (< 60 V) must always be routed separately from power cables and high-voltage cables (> 60 V) (minimum spac- ing 20 cm). Depending on the plant it may be necessary to use a spacing of 1 m where large sources of interference are present.

If this spacing is not possible, the cables must be routed in metal protective tubes or in closed metal ducts with a continuous elec- trical connection. These must be earthed every 20 m.

Suitable overvoltage arresters for lightning protection must be provided when the cables enter and leave buildings.

Analog and binary signals must be routed in separate cables.

Signal distribution cabinets and marshalling racks must be fitted between the process I/O peripherals and the TELEPERM M stan- dard cabinet in the case of larger plants. These are suitable for cross-connecting analog and binary signals and to enable grouped connections with appropriate colors in the TELEPERM M standard cabinet as a result of corresponding marshalling connections.

Connection of process signal cables via cabinet connection ele- ments SAE

Using cabinet connection elements (SAE) it is possible

•to marshall within the standard cabinet between the cabinet connection elements and the subracks,

•to convert the standard connection system (Maxi-Termi-Point or wire-wrap) into a different system or

•to connect process signal cables to the front.

If requested by the customer, the internal system wiring between the cabinet connection elements and the base plugs X2 of the subracks can already be carried out in the factory. If this is required, an SAE locating and labelling diagram as well as an SAE wiring list must be enclosed with the order.

2 basic elements are available:

•Cabinet connection element SAE 32/3 (6DS9 907-8BA) Process side: Maxi-Termi-Point pins

	2.4 mm x 0.8 mm
Internal:	Wire-wrap pins 1 mm x 1 mm.

•Cabinet connection element SAE 32/1 (6DS9 907-8AA) Process side: Maxi-Termi-Point pins

2.4mm x 0.8 mm

Internal:	Maxi-Termi-Point pins
	2.4 mm x 0.8 mm

The cabinet connection elements are mounted by latching into the SAE bars on the left side of the cabinet.

Any length of cabinet connection element blocks can be pro- duced. The bottom basic element in each case is secured using 2 Fillister head screws.

A pair of labelling cards is required for each group of 4 basic ele- ments to label the front and rear pins. 2 types of labelling are possible:

Connections for process signal cables

The process signal cables must be inserted into the cabinet (AS 235 and AS 235 H) or housing (AS 235 K) of the automation system from below. Their screens must be connected to the cable clamping rails.

The process signal cables can be connected either directly, i.e. to the base plugs X2 of the extension units (AS 235 or AS 235 H) or to the process connection panel (AS 235 K), or also via cable connection elements SAE (only AS 235 and AS 235 H).

Direct connection of process cables

In the case of a direct connection, the process signal cables are directly connected to the base plugs X2 of the I/O slots (AS 235 or AS 235 H) or to the process connection panel (AS 235 K) using the Maxi-Termi-Point system.

Base plugs X2 with wire-wrap connections are not suitable for direct connection of process signal cables.

The slots 1 to 5 for I/O modules of the AS 235 basic unit can be wired using the wire-wrap system or the Maxi-Termi-Point sys- tem. Slot 6 can only be wired using the wire-wrap system. The process signal cables leading to these slots must therefore not be wired directly. They must be converted via cabinet connec- tion elements SAE (Maxi-Termi-Point/wire-wrap).

•For numbering of the 32 pins of a basic element from 1 to 32 or 32 to 1

(labelling cards 6XP1 846 and 6XP1 847)

•For identifying groups of 8 pins of a basic element by A to H, e.g. for cables with color codes for 8 conductors (labelling cards 6DS9 906-8DA).

The basic elements are numbered with the corresponding label- ling strips according to the selected labelling cards:

•For labelling cards 1-32/32-1 for continuous or block-by-block numbering of the basic elements

(labelling strips 6XP1 856)

•For labelling cards A-H/H-A for continuous or block-by-block numbering of the groups of 8

(labelling strips C79165-A3012-C99)

Additional elements are available for the two basic SAE ele- ments and enable either screw terminal connections or plug connections at the process end. The additional elements are plugged onto the basic elements.

Ordering of cabinet connection elements: see pages 3/23 and 3/26

3/28	Siemens PLT 111 · 1999