Toshiba DeviceNet nv Series, Инструкция по эксплуатации, Страница: 65 / 159

4.3 Requests to the DN611B
Unified Controller nv Series DeviceNet Module DN611B Instruction Manual
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4) DN611B Parameters (PARA_LOCAL)
PARA_LOCAL structure:
PORT WORD type Port No.
LOCAL_ADR WORD type Local node address
POL_TRMODE WORD type Polling transmission mode
SCAN_INTERVAL WORD type Scan interval waiting time
BGPOL_RATIO WORD type Background poll ratio
RETR_CNT WORD type Retransmission counter
TR_TIMING WORD type Transmission timing
Table 4-3 DN611B Parameters
Parameters Description
Port No. Set 0 fixed.
Local node address The same address as set with the switches
Polling transmission
mode
Set 1 fixed.
Scan interval wait time Specify a wait time for the next access to start after completing access to all
slave devices.
Minimum: 2 ms Maximum: 10,000 ms
Background poll ratio Devices for which background polling is specified (set with slave parameters)
are accessed at the scan interval set in poll ratio.
Example: If 5 is set, access is made every 5 scans. This parameter is
effective for both polling mode devices and bit strobe mode devices.
Retransmission counter Set 1 fixed.
Transmission timing
A value for slave devices to detect transmission timeout if the DN611B
doesn't access for a certain interval or more. Set a value greater than the
scan cycle of slave devices (usually, 100 ms or more).
When a slave device with background polling is installed, set a value of time
longer than (scan cycle x poll ratio).