8
EtherCAT
®
Communication Protocol Manual
– p/n 20021549-001 Rev. B
Device Address Switches
The Device ID and the Configured Station Alias can be set by three hexadecimal rotary switches
(labeled “ID” in
Figure 1) as stated in ETG.5003.1 and ETG.1020.
𝐴𝑑𝑑𝑟𝑒𝑠𝑠 = 𝑥100(0𝑥100) + 𝑥10(0𝑥10) + 𝑥1(0𝑥1)
For example, if the address switches from MSD to LSD are set to “321” –
𝐴𝑑𝑑𝑟𝑒𝑠𝑠 = 3(0𝑥100) + 2(0𝑥10) + 3(0𝑥1) = 0𝑥321
4
Device Profile
The 392 is a Vacuum Pressure Gauge (VPG) Combo Device (CG) conforming to ETG.5003.2080. Two pressure
sensors
are used to create “Combination” pressures. Each pressure sensor is its own Module.
Table 4: Module to Sensor Mapping
Module Number
Pressure Sensor
0
Conductron (Heat Transfer)
1
Hot Cathode Ion
5
Process Data Objects
Fast information flow (polling rates up to 1ms according to ETG.5003.1) between Slave and the Master is ensured
by the use of PDOs. Important information (i.e. pressure
– see Poll Current Pressure) is mapped from the Object
Dictionary into PDO objects. Information about setting PDOs is found in Modifying PDO Mapping and ETG.1020.
Per ETG.5003.2080, each Module has its own set of PDOs. Therefore the 392 provides two RxPDOs and two
TxPDOs as user PDOs along with user RxPDO and the user TxPDO for the device. Each is limited to 8 sub-
indices (or 8 objects) that can be mapped to that user PDO.
Table 5: Module to PDO Mapping
Module Number
RxPDO Indexes
TxPDO Indexes
0
0x1600, 0x1601
0x1A00, 0x1A01
1
0x1602, 0x1603
0x1A02, 0x1A03
The device as a whole also has two sets of PDOs.
RxPDO Indexes
TxPDO Indexes
0x17FE, 0x17FF
0x1BFE, 0x1BFF
The default PDO is populated with information about the Combination Pressure.
Table 6: Device Default PDO
PDO Index
Sub
Index
PDO Entry
Index
PDO Sub
Index
Bit
Length
Name
0x1BFE
0x01
0xF380
0x00
8
Active Exception Status
0x02
0xF640
0x01
1
Combination Gauge
Reading Valid
0x03
0xF640
0x02
1
Combination Gauge
Overrange Exceeded
0x04
0xF640
0x03
1
Combination Gauge
