Watlow CLS200, MLS300 and CAS200 Manual de usuario descargar pdf (Pagina 61)

Chapter 3: Controller Parameter Descriptions

Communications Speciﬁcation 55

The Anafaze/AB protocol returns all 8 bits in 1 byte. See the table

below.

The Modbus-RTU protocol stores the states of the inputs in eight

individually addressable discrete input registers.

Digital Outputs (26)

This parameter contains the state of the controller’s digital outputs. If

the output is off (an open circuit), the value is 0. If the output is on, the

value is 1. To turn on an output, set the corresponding bit to 1.

The Anafaze/AB protocol stores the states for up to eight outputs in 1

byte. So, a total of 5 bytes are required to store the states of the 35

digital outputs in a controller. See the table below to decode the bits.

• Default: 0 (off).

The Modbus-RTU protocol stores the states of the outputs in 35

individually addressable coil registers.

Override Digital Input (28)

This parameter enables the output override feature and selects a digital

input to trigger it. When the feature is enabled and the speciﬁed input is

activated, the controller sets all loops to manual mode at the heat and

cool outputs at the levels speciﬁed by the Output Override parameters.

• Range: 0 to 8 (Disabled = 0, Enabled = 1 to 8, indicating the selected

digital input).

• Default: 0.

Override Polarity (29)

Specify whether a low or high signal activates the output override

feature.

• Range: 0 or 1 (Low = 0, High = 1).

• Default: 0.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Input 8 Input 7 Input 6 input 5 Input 4 Input 3 Input 2 Input 1

Bit

Bit 5 Bit

Bit 3 Bit

Bit

Byte 0 8 7 6 5 4 3 2 1

Byte 1 16 15 14 13 12 11 10 9

Byte 2 24 23 22 21 20 19 18 17

Byte 3 32 31 30 29 28 27 26 25

Byte 4 Not used 35 34 33

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 91 92

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Watlow CLS200, MLS300 and CAS200 Manual de usuario Pagina 61