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On power up, or following a reset using the

PACS

Reset parameter, the PACS

Control Register

parameter is cleared to $00. If a PACS

timeout occurs,

bits 0, 1, and 2 will be cleared by the DHC controller. A

PACS

timeout occurs when the DHC controller does not

receive a requesting ADU (which can be a broadcast

command) from the bus after a certain amount of time. The

time allowed is set using the PACS

Timeout Setting

parameter.

Note that the PACS

Timeout Setting parameter

is also cleared on power up and must be set to a non-zero

value before bits 0 to 2 can be changed. If the timeout

setting is zero when the PACS

Control Register

parameter is written to a DHC-400 controller, the DHC-400

will automatically set the timeout value to 4 (2 seconds) if

bit 0, 1, or 2 are set to "1".

Since bits 0 to 2 allow the bus to run the actuator,

the DHC controller must be in the AUTO mode (see

CONTROL HIERARCHY in Section I) before it acts on

these bits. The values of bits 0 to 2 are not affected if the

DHC is put in a mode other than AUTO.

Bit 0 - "command override control"

When this bit is "0", the DHC controller will use

the Analog Command Input parameter (see

Section II) to control the valve. When this bit is

"1", the DHC will use the PACS

Command

Input parameter to control the valve. If the DHC

is configured for a Digital command type, this bit is

essentially ignored since there is no analog

command signal. In this case, the DHC will use

the PACS

Command Input regardless of the

value of bit 0.

Bits 1 & 2 - "PACS

manual control"

These bits are used to directly control the DHC

outputs in the same way as the MANUAL mode

from the DHC control panel. The bits are assigned

as follows:

2 1

0 0

PACS

manual control disabled

0 1

turn on M2

1 0

turn on M1

1 1

turn off M1 and M2

When both bits are "0", manual control from the

bus is disabled. When either bit is set to "1", the

Mode parameter (see Section II) will read 10

decimal to indicate PACS

Manual mode. Also,

bit 0 and the command input signal (analog or

digital) are ignored, which gives "PACS

manual

control" priority over "command override control".

The M1 output is the one that turns on with the ▲

button when the DHC controller is in the

MANUAL mode, and the M2 output corresponds

to the ▼ button. The direction the actuator moves

depends on the wiring to the actuator motor.

CAUTION! These bits turn on the DHC outputs;

power to the output is maintained until turned off

via the bus. Limit switches in the actuator will be

required to disconnect power at the mechanical

limits of the actuator. Upon reaching a limit

switch, or a mechanical limit, the DHC controller

will detect a stall which can be read using the alarm

flags parameters (see Section II).

Bits 3 & 6 - unassigned

Bits 3 and 6 are unassigned and can be set to "1" or

"0", but their values perform no function. Using

these bits is not recommended since future versions

of the DHC Series may assign these bits to other

control functions.

Bits 4 & 5 - "set loss of command"

When configured for a 4-20mA, 1-5V, 2-10V

(DHC-400 only), or Digital command type, the

DHC controller can detect when the command

signal has been lost. From the DHC control panel,

the DHC can be configured to go to close, go to

open, or turn off the outputs (last position) using

the LOSS OF COMMAND mode. Alternatively,

the DHC can be configured via the bus using bits 4

and 5 as shown below:

5 4

0 1

last position (both outputs off)

1 0

1 1

open

These bits will always read zero; to read the

setting, use the Configuration parameter (see

Section II). Setting both bits to "0" has no affect,

and the previous setting remains. The setting is

saved in non-volatile memory, so the setting is

retained until it is changed from the DHC control

panel or via the bus.

Bit 7 - "power monitor"

This bit is set to "0" when the DHC powers up, or

is reset using the PACS

Reset parameter. This bit

can only be set to "1" via the bus. After setting this

bit to "1", the bit can be monitored to detect that the

DHC controller experienced a power loss. This is

particularly useful if the bus is being used to

control the DHC outputs - see PACS

Command

Input and PACS

Timeout Setting parameters.

Since the PACS

Control Register parameter is

divided into groups of bits, setting particular bits without

affecting others can be more effectively done using the

Brand	Peaktronics
Model	92 Series
Category	Controller
Language	English

Peaktronics 92 Series User Manual

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