Programming the Control Sockets R, H, and P on the Desktop Analog Computers RAT 700, RA 710, RAT 740, and RA 741

This document is a translation of the original German-language AEG-Telefunken application note “Programmierung der Steuerbuchsen R, H und P bei den Tischanalogrechern RAT 700, RA 710, RAT 740 und RA 741.”

Introduction

The following document describes how programmers of the desktop analog computers RAT 700, RA 710, RAT 740, and RA 741 can use the control sockets R, H, and P in connection with these computers. In addition to the normal operating procedure of the computer, these sockets enable the computer to be used in more complex programmed solutions. A precise description is given in the (DIN standard?) DIN 68 21 (?). The sockets serve the functions “Compute” (Rechnen), “Halt” (Halt), and “Pause” (Pause).

Control Socket R

With a relay ground (Relaiserde) applied to socket R, the computer begins computing (provided it was not already in compute mode and not in Pause). The duration of the compute cycle is determined by the setting of the timer.

Case a) Single compute run (“1x Rechnen”)

For RAT 700 in switch position ”.” or “0.1 s” or “1 s” and with a Repetierstecker (repeat plug) inserted
For RAT 740/RA 741 in switch position “N”

For checking purposes, the lamp of the operating mode key “1x Rechnen” illuminates for the entire compute time (even if a halt time has been programmed via the H socket during the compute run).

If relay ground is applied to R during continuous computing (Dauerrechnen), this does not disturb the control sequence (s.u.).

Control Socket H

A control signal on socket H is always dominant over a signal on socket R.

By applying relay ground to the H control socket, the computer goes into Halt (provided it was not previously in Halt and not in Pause). This state persists as long as the control signal on H is active; simultaneously the lamp of the operating mode key “Halt” lights up. After the end of the halt phase, the compute phase is continued without a timer up to the end of the set compute time (in Case a, under control socket R) (provided no interruption by further halt commands or an abort command via the P socket occurs).

A frequent application of socket H is the halt control of the computer as a function of a certain limit value of a computed quantity. For this purpose, the value corresponding to the limit is compared with the computed quantity itself by means of a comparator, and this relay ground is switched to H (see Example 1).

Control Socket P

The control signal on socket P is dominant over a signal on the R or H socket.

By applying relay ground to the P socket, the computer goes into Pause (Pause). The lamp of the operating mode key “Pause” lights up. As long as the control signal on P acts, the computer remains in Pause, even if a restart command is given via the “1x Rechnen” key. This is indicated by the display of the key “Pause” during the Pause phase.

If control ground is given via R and H simultaneously, the P command always prevails, and the computer cannot be restarted by R or H.

Subsequently, a brief description of the most important control socket combinations and the corresponding two-state control diagrams of the computer follows.

Example 1

Halt control of the computer as a function of a limit value of a computed variable.

The computer (Example: RAT 700) computes a specific function. Using a comparator, the value X = 4.8 is detected; at this point the relay contact switches and halt ground is applied to socket H.

[Diagram: Bild 1 — Halt control as a function of a computed variable. The timing diagram shows the R (compute) state and the H (halt) state of the computer plotted against time.]

Example 2

Selected operating mode: “1x Rechnen” (single compute run), set compute time T_R. External halt commands per Bild 2.

The sequence of control states depending on the halt commands is likewise shown in Bild 2.

[Diagram: Bild 2 — External halt commands in “1x Rechnen” mode.
Control command H: relay ground / free
Control states R, H, P of the computer.
Compute time: T_R = T_R1 + T_R2 + T_R3 + T_R4
Pause → Compute start via “1x Rechnen” → … → Compute end via timer.]

Example 3

Selected operating mode: “Dauerrechnen” (continuous compute). External halt and pause commands per Bild 3.

[Diagram: Bild 3 — External halt commands and pause command in continuous compute mode.
Control command H: relay ground / free
Control command P: relay ground / free
Control states R, H, P of the computer.
Compute start via “Dauerrechnen” → multiple halt and pause phases.]

Example 4

External control command sequence for R, H, and P with switch S 8 in position “1 s” or S 10 in position “X 1”, and set compute time T_R (Case a). Control sequence: see Bild 4.

[Diagram: Bild 4 — External halt commands in “1x Rechnen” mode.
Control commands R, H, P (relay ground / free).
Control state of computer (R, H, P).
Compute time: T_R = T_R1 + T_R2 + T_R3
The pause command remains ineffective because it is not given until after the set compute time T_R has elapsed.]

Bild 4 label: “Externe Haltsteuerbefehle bei ‘1x Rechnen‘“

Example 5

External control command sequence for R, H, and P with switch S 8 in position ”.” or S 10 in position “N” (Case b — continuous compute). Control sequence: see Bild 5.

[Diagram: Bild 5 — External control command sequence.
Control commands R, H, P (relay ground / pot-free).
Control state of computer (R, H, P).
Multiple compute, halt, and pause phases shown.]

[Translation covers all 6 pages; the original is complete at 6 pages — no additional content remains.]