Interfaces and software update
Chapter 6
OPERATION MANUAL
V1.2.0en/12.05.15//14.06
Liability for errors and misprints excluded.
Unistat® T300 Series
71
The potential-free contact indicates the condition, that the setpoint differs from the actual value
by a smaller difference than was defined by the temperature range. Exceeding the set range only
results in the potential-free contact to switch (away from the OK state), but does not result in fur-
ther reactions of the temperature control unit. The contact returns to the OK status if the actual
value is within that range.
▪
“Unipump with Echo”:
This function is used to check whether the Unipump controlled by the
POKO runs synchronous with the Unistat pump. For this purpose, the operating mode of the
Unipump is applied via a make contact to the “LEVEL” socket. A fault is generated if asynchro-
nous. This mode is useful if a Unipump is to be monitored - either to guarantee the desired circu-
lation or to prevent an unintended heating of the thermal fluid.
▪
“Programmer”:
This activates the individual segments associated during program creation with
the POKO switching states.
▪
“Internal temperature absolute”:
This enables you to set a temperature range relative to the
internal sensor (absolute temperature). The POCO is active outside of this range; the POCO is in-
active inside of this range.
▪
“Process temperature absolute”:
This enables you to set a temperature range relative to the
process temperature (absolute temperature). The POCO is active outside of this range; the POCO
is inactive inside of this range.
With the floating contact, use only sheathed lines! The interface is specified as a digital output.
The connection is designed as a potential-free changeover contact.
Closing contact between pin 1 and pin 2.
Opening contact between pin 2 and pin 3.
Contact load: 1 A at 24 V DC.
6.2.2
Interfaces at the “Unistat® Control ONE” top side
6.2.2.1
Service interface
This interface is used by the service engineers of Peter Huber Kältemaschinenbau GmbH exclusively
for service purposes. An adapter cable connects this interface to a RS232 serial jack.
6.2.2.2
Female RS232 Serial (with adapter cable)
A PC, a SPS or a Process Control System (PCS) can be connected to this jack for remote control of the
controller electronics. Before plugging in the cable, check the settings in the “Interfaces” category
and adjust if necessary.
The interfaces used must meet the specifications of the generally accepted standards.
Pin
Signal
Description
2
RxD
Receive Data
3
TxD
Transmit Data
5
GND
Signal GND
Standard interfaces
at the “Unistat Con-
trol ONE” top side.
Pin assignment
