Festo FEC

The following applies to Festo FEC series PLC’s.

Details on the device address can be found in the Device Properties Topic

External Address Format

The External Address is an ascii string which exactly references an item of data within the PLC. It can be entered at configure time as a text string, and will be validated by the system before use. For this protocol the external address has the following format:

N - Dec number 0 - 9

Type	Offset
E	NNN
A	NNN
M	NNNN
R	NNN
T	NNN
TA	NNN
TE	NNN
TV	NNN
TW	NNN
Z	NNN
ZV	NNN
ZW	NNN

Offset Format

The software also allows an item of data within the PLC to be referenced by means of a table selection and an offset. The following table shows the offset and table formats for the Festo PLC:

Table	External Address Type	Type	Offset Format	Offset Range	Privilege R = Read W = Write	Description
E Table	E	Word	NNN	000-255	RW	Inputs
A Table	A	Word	NNN	000-255	RW	Outputs
M Table	M	Word	NNNN	0000-9999	RW	Flags
R Table	R	Word	NNN	000-255	RW	Registers
T Table	T	Bit	NNN	000-255	RW	Pulse Timer Status
TA Table	TA	Bit	NNN	000-255	RW	Switch-Off Timer Status
TE Table	TE	Bit	NNN	000-255	RW	Switch-On Timer Status
TV Table	TV	Word	NNN	000-255	RW	Timer Preset
TW Table	TW	Word	NNN	000-255	RW	Timer Word
Z Table	Z	Bit	NNN	000-255	RW	Counter Status
ZV Table	ZV	Word	NNN	000-255	RW	Counter Preset
ZW Table	ZW	Word	NNN	000-255	RW	Counter Word

Property Pages

No property pages exist for this protocol

Protocol Compatibility

A bit type table such as ‘Z’ will support the configuration of point types bigger than a bit. If a 16-bit point is configured for example, 16 bits will be read from the table to fill the point. Only 16 bits can be read at once, so types that are bigger than 16 bits will result in a comms block error. Only one bit can be written at once, so driveouts to point types larger than a single bit are not supported.

A word type table such as ‘R’ supports the configuration of smaller or bigger point types. All larger point types will read the required number of words to fill the point. Byte type points will scale down the word to fit it into a byte. Bit type points allow the selection of a bit offset to reference the required bit from the word (0-15). In the case of bit selection points, drive out behaviour depends on the table where the point is configured:

E, A, M: These tables support a direct bit set operation.

R, TV, TW, ZV, ZW: These tables use a read/modify/write operation to set a bit within a word.

Port Settings

The following shows the port setup for the Festo PLC:

RS232

	Baud Rate	9600
	Data Bits	8
	Stop Bits	1.0
	Parity	None

Note that OPC Server running on a PC will require RTS flow control to be set to ‘Always Set’ with the wiring shown below.

Wiring Information

Connection of the PLC to a panel will be via either COM1 or COM2, using RS232 communications. The panel pin out diagram is shown below:

Connection of the PLC to a PC running OPC Server will be via any available COM port, which may be either 25 pin or 9 pin depending on what is available. The COM port pin out is shown below:

The Festo PLC has a four-way RJ socket. Connection to the Festo PLC requires the following wiring:

Examples

An example of an external address for the 15th Input would be:

E014

An example of the last word on the flags table would be:

M9999