Gonnheimer Elektronic DC 155, Руководство пользователя

Страница: 13 / 41

DC155 4 manual Page 13
Gönnheimer Elektronic GmbH phone.: +49 (6321) 49919-0, fax: -41 Email: info@goennheimer.de
configuration, key blocking) as well as changing code words. The factory setting of this access code
"0003" . Entering the structure menu access code cannot get disabled by setting the access code to
"0000" . The highest safety level is dedicated to plant engineers.
2.7.2 Key locking
In some applications the DC155 is controlled using a decentralized control system (DCS) with no need for
manual control. In these cases, it is possible to block some or all keys of the DC155 to prevent an unauthorised
intervention.
The DC155 has three key locking levels:
1. Any key is enabled
2. Any key is locked, except the START, STOP and RESET keys
3. Any key is locked
The key locking is only active , if the key lock signal input (terminal 15) is high.
2.8 Remote control / bus coupling
The DC155 has several interfaces for remote control.
2.8.1 Remote control via digital inputs
The DC155 has five predefined digital inputs ( START, STOP, RESET, INHIBIT and KEY LOCK ) to
realise a simple remote control with active or passive switches.
The polarity of these inputs, except the STOP input, is "normally open". There are two STOP inputs: one is
"normally close", the other is "normally open".
2.8.2 TTY- interface and protocol print (Option)
The DC155 can also get controlled by using the serial TTY-interface and ESC -sequences, see the instruction
codes in the following table:
Instruction code Function
ESC 0 Reads the actual counter value
ESC S START- instruction
ESC P STOP- instruction
ESC Z RESET- instruction
ESC K1 Enable keys (equals setting the keylock-input low)
ESC K0 Lock keys (equals setting the keylock-input high)
ESC B SETPOINT Sets the quantity setpoint
ACK (hex. 06) Answer to a known instruction
NAK (hex. 15) Answer to an unknown instruction