SMEMA
SMEMA is an acronym for Surface Mount Equipment Manufacturers Association, an international, non-profit standardization organization .
In 1999, SMEMA and IPC merged and have since formed the SMEMA Council of IPC .
origin
The SMEMA standards describe terms, software (e.g. data types and formats) and hardware guidelines (e.g. wiring) for communication between production systems and machines. They originally come from the area of surface mounting and are manufacturer-independent. These simplify the data exchange between production systems of different machine builders .
content
The complete set of rules comprises seven general volumes, which are divided as follows:
- SMEMA 1 - Surface Mount Placement Equipment Characterization (SMEMA 1.1) and Mechanical Equipment Interface Standard (SMEMA 1.2)
- SMEMA 2 - Standard Recipe File Format Specification
- SMEMA 3 - Fiducial Mark Standard
- SMEMA 4 - Reflow Terms and Definitions
- SMEMA 5 - Screen Printing Terms and Definitions
- SMEMA 6 - Electronics Cleaning Terms and Definitions
- SMEMA 7 - Fluid Dispensing Terms and Definitions
In addition, there are further guidelines or stipulations, mostly tailored to special applications.
application
Signals that reflect the status of the systems are switched and evaluated. This includes, for example, the availability of a new circuit board (board available), the readiness to accept a new assembly (ready to receive) or the part status of a component (PASS, FAIL, etc.). There is also the option of transmitting data via a serial interface (e.g. RS-232 ), which is often used to transmit component and board sizes.
Communication takes place exclusively in a defined order. Every information sent must be followed by a suitable response before it is declared valid or executable. Resetting the signals is also regulated and monitored.
SMEMA does not provide for the exchange of safety-relevant signals (e.g. emergency stop ). If they are required, they must be sent separately.
Wiring and connector
The SMEMA communication cable is 14-pin. The interface on the system is always designed as a female connector . The connection cable therefore always has two male connectors. In the basic configuration, only the first four lines are connected and, if necessary, the 14th pin is used as a shield .
To set the signals, SMEMA uses potential-free contacts that switch the external voltage fed in to the upstream or downstream cell.
Individual evidence
- ↑ PDF 'From Vacuum Tubes to Nanotubes: An Amazing Half Century' ( Memento of the original from January 7, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. published by IPC, written by Michael L. Martel, 2007
- ↑ PDF 'IPC-2531 SMEMA Standard Recipe File Format Specification' ( Memento of the original from March 6, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. at ipc.org
- ↑ PDF 'SMEMA Interface Standard 1.2 - SMEMA Mechanical Equipment Interface Standard' at dynamixtechnology.com
- ↑ PDF 'IPC-SMEMA-9851 - Mechanical Equipment Interface Standard' ( Memento of the original dated March 6, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. at ocmmanufacturing.com
