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[N/B] Parameters |
N1/B1 |
PLC address |
N2/B2 |
Data format. For more information, please check tables Data types and Bits per memory unit |
N3/B3 |
Memory address |
N4/B4 |
Data handling mode. Possible values are 0: BCD or 1: Binary |
Use PLC Tags to perform readings or writings to a single memory position of a PLC, defined in N3.
Use Block Tags to perform readings or writings to more than one memory position of a PLC. Each Block Tag Element represents a sequential memory position, always starting at the initial address specified in B3.
Memory addresses of Koyo PLCs (V-Memory address) are in octal format, and they must be converted to the DirectNet format before referencing them in specified in N3/B3.
Take an example of reading an address V02001 (2001 in octal). Users must convert it to decimal (2001 in octal is equal to 1025 in decimal) and add one to this value, thus getting a final value of 1026. Therefore, to read the address V02001, users must configure the N3/B3 parameter as 1026.
Data format in B2 is a concatenation of values of data types with values of bits per memory units, according to the next examples:
•B2 = 13, where 1 (one) is equal to "Data Type 31" and 3 (three) is equal to "16 bits per memory unit"
•B2 = 12, where 1 (one) is equal to "Data Type 31" and 2 (two) is equal to "eight bits per memory unit"
•B2 = 21, where 2 (two) is equal to "Data Type 32" and 1 (one) is equal to "one bit per memory unit"
Value |
Type |
|---|---|
1 |
Data Type 31 (V memory, Timer/Counter value) |
2 |
Data Type 32 (Inputs - X, GX, SP) |
3 |
Data Type 33 (Outputs - Y, C, Stage, Timer/Counter Bits) |
9 |
Data Type 39 (Diagnostic Status) |
Value |
Bits |
|---|---|
1 |
One bit |
2 |
Eight bits |
3 |
16 bits |
This Driver supports multiple data block readings with up to 256 bytes. Its protocol supports data transfers up to 255 data blocks. Thus, users can transfer up to 65,280 bytes (256 x 255). As one value is returned for each Block Element, maximum values are the following:
•8-bit memory reading: Maximum of 65,280 Elements
•16-bit memory reading: Maximum of 32,640 Elements
•8-bit memory reading: Maximum of 32,640 Elements
•16-bit memory reading: Maximum of 16,320 Elements
This Driver's protocol is transmitted serially, byte by byte in hexadecimal format, but this Driver can interpret this data as a value in BCD mode (N4 equal to zero) or as a value in Binary mode (N4 equal to one).
For example, let's suppose a value 22h, in hexadecimal, is received. If this value is handled in BCD mode, this Driver returns 22 in decimal. If this value is handled in Binary mode, this Driver returns 34 in decimal.
This Driver uses that data handling mechanism for readings and for writings.