ABB LDSYN-101 3BHE005555R0101 Communication board

Description

Serial I/O protocol is a communication protocol that is driven entirely by the application program.

Serial I/O protocol is active only when the CPU is in RUN Mode, since it is driven completely by

COMMREQ functions in the application program. Those COMMREQ functions are described in detail

within this section.

When the CPU is stopped, a port configured for Serial I/O protocol will revert to a STOP Mode protocol

as specified in the port settings of the CPU configuration. If a STOP Mode protocol was not specified,

RTU slave protocol is used by default.

6.2.1 Calling Serial I/O COMMREQs from the CPU Sweep

Implementing a serial protocol using Serial I/O COMMREQs may be restricted by the sweep time. For

example, if the protocol requires that a reply to a certain message from the remote device be

initiated within 5ms of receiving the message, this method may not be successful if the sweep time is

5ms or longer, since timely response is not guaranteed.

6.2.2 Compatibility

The COMMREQ function blocks supported by Serial I/O are not supported by other currently existing

protocols (such as SNP slave and RTU slave). Errors are returned if they are attempted for a port

configured for one of those protocols.

6.2.3 Status Word for Serial I/O COMMREQs

A value of 1 is returned in the COMMREQ status word upon successful completion of the COMMREQ.

Any other value returned is an error code where the low byte is a major error code and the high byte

is a minor error code.

Serial I/O protocol is a communication protocol that is driven entirely by the application program.

Serial I/O protocol is active only when the CPU is in RUN Mode, since it is driven completely by

COMMREQ functions in the application program. Those COMMREQ functions are described in detail

within this section.

When the CPU is stopped, a port configured for Serial I/O protocol will revert to a STOP Mode protocol

as specified in the port settings of the CPU configuration. If a STOP Mode protocol was not specified,

RTU slave protocol is used by default.

6.2.1 Calling Serial I/O COMMREQs from the CPU Sweep

Implementing a serial protocol using Serial I/O COMMREQs may be restricted by the sweep time. For

example, if the protocol requires that a reply to a certain message from the remote device be

initiated within 5ms of receiving the message, this method may not be successful if the sweep time is

5ms or longer, since timely response is not guaranteed.

6.2.2 Compatibility

The COMMREQ function blocks supported by Serial I/O are not supported by other currently existing

protocols (such as SNP slave and RTU slave). Errors are returned if they are attempted for a port

configured for one of those protocols.

6.2.3 Status Word for Serial I/O COMMREQs

A value of 1 is returned in the COMMREQ status word upon successful completion of the COMMREQ.

Any other value returned is an error code where the low byte is a major error code and the high byte

is a minor error code.

Details: If you need an urgent delivery order, please feel free to contact us, and we will do our best to meet your needs.
Price issue: If you find that other suppliers offer a cheaper price for the same product, we are also willing to provide you with a reference price and give you further discounts.
Contact Us:+86 18106937731
Whatapp:+86 15359293870
Email: geabbdcs@gmail.com / 2872270648@qq.com
Contact Person: Chen

Stock products of the same series: