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4.3.2.Driver Specific Map Descriptor Parameters
Column Title | Function |
| Legal Values | |
Node_Name | Name of Node to | One of the node names | ||
specified in “Node Descriptor” | ||||
communicate with | ||||
| above | |||
|
| |||
Block_Number | PLC File Number | For local node | ||
For remote node | ||||
|
| |||
|
|
| ||
| Type of PCCC data to be | UINT, (SINT, INT) (REAL, | ||
PCCC_Type | FLOAT) (BOOL, BIT, FLAG) | |||
transferred over | ||||
Equal types are shown in | ||||
| ControlNet | |||
| brackets. | |||
|
| |||
|
| 0 | – 999 ( INT, SINT ) | |
Address | Starting address within file | 0 | – 499 ( REAL, FLOAT ) | |
|
| 0 | – 15999 ( BOOL, BIT, FLAG ) | |
|
| 1 | – 249 ( INT, SINT ) | |
Length | Length of Map Descriptor | 1 | – 124 ( REAL, FLOAT ) | |
|
| 1 | – 3984 ( BOOL, BIT, FLAG ) | |
Note the number of bytes per PCCC_Type:
SINT, INT = 2 bytes, REAL, FLOAT = 4 bytes, BOOL, BIT, FLAG = 8 bits per byte
Each PLC file is 2000 bytes long and therefore the address values will range from zero to a maximum value as indicated. The start address is specified in increments of the basic data type specified under PCCC_Type.
The message buffers in the ControlNet card are each 498 bytes long and only one message buffer can be allocated to a Map Descriptor. The Map Descriptor lengths are therefore limited to maximum values as indicated when taking the data type byte lengths into account.
4.3.3.Timing Parameters
Column Title | Function | Legal Values |
Scan_Interval | Rate at which data is polled | >0.1s |
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