Watlow Series SD6 PID Controller with DeviceNet Addendum Manuale Utente Scaricare il pdf (Pagina 8)

Watlow Series SD6 PID with DeviceNet ■ 8 ■

Class Services: NONE

Instance Services:

• 0x0E GET ATTRIBUTE SINGLE

• 0x10 SET ATTRIBUTE SINGLE

Additional Poll Connection information:

• In the event of the input error, a valid process value reading is no longer available. The poll connection will return a

value of 9999.999 for the process value while the error condition exists.

• Bit 1 and bit 2 of byte 4 in the output poll connection select whether set point and auto / manual mode values are

changed from the SD’s front panel or else over DeviceNet through the poll connection. Setting the bit to “zero” will relin-

quish control of the parameter to the DeviceNet master device (typically the master is a PLC). Setting the bit to “one” will

retain control of the parameter locally at the front panel of the Series SD controller. If there is a loss of communications,

control of auto / manual mode and adjustment of set point will automatically return to the Series SD front panel regardless

of the settings of byte 4 in the output poll connection.

Connection Object

Class Code: 05hex

The Connection Class allocates and manages the internal resources associated with both I/O and Explicit Messaging

Connections. The specific instance generated by the Connection Class is referred to as a Connection Instance or a

Connection Object.

A Connection Object within a particular module actually represents one of the end-points of a Connection. It is possible for

one of the Connection end-points to be configured and “active” (e.g., transmitting) without the other end-point(s) being

present. Connection Objects are used to model the communication specific characteristics of a particular application-to-

application relationship. A specific Connection Object Instance manages the communication-specific aspects related to an

end-point.

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Watlow Series SD6 PID Controller with DeviceNet Addendum Manuale Utente Pagina 8