BS 5782:1979

National foreword
Cooperating organizations
1. General
1.1 Scope
1.2 Object
2. Definitions
2.1 Numerical control
2.2 Interface
3. General requirements for interface connections
3.1 Connection of shielding
3.2 Routing and spacing of cables
3.3 Specification of cables
4. Recommendations and requirements for Group I
     interface
4.1 Isolation between numerical control and thyristor
       motor drives
4.2 Connections between control and power circuits
4.3 Hydraulic servo-valves
4.4 Velocity command voltage signals
4.5 Servo-energization
5. Recommendations and requirements for Group II
     interface
5.1 Shielding of connections
5.2 Routing of connections
5.3 Information from numerical control builder
6. Recommendations and requirements for Group III
     interface
6.1 Power supply for the numerical control
6.2 Connection to the supply network
6.3 Independent supply for thyristor drives
6.4 Protection against overcurrents
6.5 Immunity to externally generated electrical
       interference
6.6 Protection against emission of interference
       (under consideration)
6.7 Protective circuit
7. General recommendations and requirements for Group
     IV interface
7.1 Terminations and connectors
7.2 Inputs
7.3 Outputs
7.4 Power supply for input and output circuits
7.5 Suppression of transient voltages on outputs of
       the numerical control
8. Compulsory or necessary signals in Group IV
     interface
8.1 Compulsory input signals for inhibiting operations
8.3 Output signals from the numerical control to the
       machine necessary for operation
9. Auxiliary and miscellaneous signals in Group IV
     interface
9.1 Pulsed mode
9.2 Maintained mode
9.3 Time interval values
10. Examples of optional signals in Group IV interface
10.1 Numerical control is ready to move an axis
10.2 Permission for axes to move (X, Y, Z, etc.)
10.3 Block stop
10.4 Align numerical control
Figure 1 - Relations between the numerical control, the
           control equipment and the machine
Figure 2 - Group I of the interface: velocity controls
Figure 3 - Group IV of the interface: ON/OFF signals
Figure 4 - Examples of timing for miscellaneous commands
           such as those addressed by M, S or T

Standardizes all compulsory features (and others) necessary for the safe use of equipment used in numerical control of industrial machines. Defines certain signals going through the interface and recommends methods of connection and installation.

This standard applies to the interface between numerical controls (for explanations, see Clause 2) and the electrical equipment of industrial machines which are commanded by numerical controls.