Measurement-computing CIO-RELAY08 Bedienungsanleitung PDF herunterladen (Seite 9)

4 PROGRAMMING

The CIO-RELAY boards are easy to program. From one to four eight-bit registers

are written to control relays or can be read to determine the state of relays.

In addition to direct I/O programming, the boards are f ully supported by the

powerful Universal Library program as well as most third-party application

programs.

4.1 DIRECT I/O REGISTER PROGRAMMING

The CIO-RELAY family uses between one and four I/O addresses. Each address

controls eight relay s. Relays are co ntrolled by writing to these register(s). T he

address map of the CIO-RELAY boards is shown below.

BASE ADDRESS Relays 0-7 Read/Write (All CIO-RELAY boards

BASE + 1 Relays 8-15 Read/Write (CIO-RELAY16, -24, -32)

BASE + 2 Relays 16-23 Read/Write (CIO-RELAY24, -32)

BASE + 3 Relays 24-31 Read/Write (CIO-RELAY32 only)

The registers are written to and read from as a single, 8-bit byte. Each bit controls an

output to a relay (write) or represents the state of a relay (read).

All registers are read left to right. The leftmost bit (the eighth bit) being the most

significant bit. Following this format, bit seven (OP7) of BASE + 0 corresponds to

relay number 7 and bit 0 to relay number 0.

To construct a control word, use Table 4.1 for bit weights.

Table 4-1. Bit Weights

801287

40646

20325

10164

883

442

221

110

HEX VALUEDECIMAL VALUEBIT POSITION

For example, to assemble the control byte that will turn on relays 0, 1, 3, 5, and 7,

we see in Table 4-2 that we need to write HEX AB or decimal 171.

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Measurement-computing CIO-RELAY08 Bedienungsanleitung Seite 9