JPS59181843A - Communication control system in loop network - Google Patents

Abstract

PURPOSE:To attain smooth communication by starting the transmission after each node station detects the propagating time for the circulation of the loop in a loop transmission system having a synchronizing station. CONSTITUTION:The loop consists of the synchronizing station and node stations. The synchronizing station transmits a synchronizing signal in a period T0. In order to allow the synchronizing station to transmit a new synchronizing signal in the period T0 independently of a receiving signal, the transmission signal F from each node should not be overlapped with the synchronizing signal F. Signals B1, B2 and B3 are signals transmitted from each node and when the right of transmission is obtained within a time TL (<1/2T0) from the synchronizing signal F like the signal B3, a loop propagating time (tau1) detecting signal TM in the time of T2 is transmitted to detect the time tau1, in which the signal TM is circulated. The overlap with the signal F is avoided by recognizing the loop propagating time tau1 and completing the transmission within (T0-tau1).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a communication control method in a roof net soak in which a synchronizing signal is sent to a loop at a constant cycle from the start of the beam stage.

An example of a roots network in which a clock station sends a synchronization signal to a loop at a period of -53 is described in Patent Application No. 1982-212364.

O to such a network. Using Figure 1 and 2 pages 1 and 1 for the passage 6, read the following text. m Figure 1. Roof net soak beam 1 knot station 7, no 1 station 1.2.3.4.5.6 and +:; 't
Figures 2 (n), (b) and fe) show the output signals of click station 7 and node station 1.6, respectively. Synchronous signals are sent from 7 PC stations at a constant period of T0.
Send F3F. Node station 1 is 2 and 1 (
As shown in b), following the synchronization signal F,
j 70 tsuku 151 is sent.

Node station Fusion 6 is also fed from upstream of loop 8 as shown in fl(c)) IZ synchronization signal F, signal 70 of node station 1.3.4 B+, Bs
, Continuing from Ba, signal block 13. I'll send it out. Clock station 7 is always synchronized with period T, 4F+
- Since the node station transmits the signal F, each node station operates in synchronization with this (the timer indicates the period 513 of the period T6, and the transmission of the signal block is finished before 1. For example, the node stage link 6 As shown in figure (c), the timer indicates "1".
Sending ends at time (T, -Δ). However, if the time Δ is smaller than the time it takes for the signal to go around the loop 8, the following problem will occur. Right now, the signal is 70 TsukuB.
, the destination is node station 1 ζ. W 2 [
As shown in (a), the clock stage 7 removes from the loop 8 the same-month signal F which has been cycled for a period of time τ, and allows the A word block continuously supplied to KO to pass through as it is. Note that the time position of the removed synchronization signal is indicated by a broken line. However, the period T. is red, i7. ? Regardless of whether there is a signal on the loop or not, the block synchronization signal 4t='F is sent out. In this case, △〈τ1, so before the signal flock passes 13゜, the same fJ! I β F is jY,
As shown in FIG. 1(a), the output signal E is guided to the clock station 7 as shown in FIG. Therefore, as shown in FIG. 2 (bl), the node station IK is supplied with the signal block B6 and is correct
I can't believe it.

In this way, each node station does not know the time it takes for a signal to go around the loop, even if its own timer is
Even if the transmission ends before the transmission ends, the synchronization signal F may interfere and prevent smooth communication service.

Nth track of main hole Eri 1, N block of inter-node communication is 1
・1st period (7745, there is a need to avoid interference from F.

In the communication Il control method in the loop network of the present invention, 1 has one link station and 1 fflf.
It is composed of i node stations, and the previous F self-lock station sends the h period signal to the loop at a constant cycle.
4. In the loop network, the node slurtion is detected by the passage of the synchronization signal, and a timer for detecting the loop propagation interval is set to Transmission of signal flocks and performing Buddha's birth No. 1-
After that, the loop propagation time is calculated from the period, and the transmission 18 control for communication between node stages is started, and during communication between node stages or transmission case acquisition control, the timer calculates the loop propagation time from the period. After outputting the time after subtracting (・) or the time obtained by subtracting a certain margin time from the previous 6-pi time, transmission or transmission right acquisition control will be stopped. I will explain the details in detail.The first embodiment of the present invention will be explained using the loop network shown in FIG. 1 and the timing diagram shown in FIG. Until the transmission and reception of the signal flock TM are completed, no further communication to other node stations will be made. For example, note stage practice 6
is newly accommodated in the loop network, the node station 6 receives the transmission right 5! control the gain, but the third
As shown in the figure, 'fA'a, which acquired the transmission right at time T+ (T+ >i'L), is e(+! Block TM is not transmitted. within a certain period σ); fine side T, "(T
o<TL), the signal block ``I''M is transmitted as shown in No. 31).Since the time ``rL is smaller than the period T, the signal block 1''M is interfered with by the synchronization signal FK. Kotona (going around loop 8).

This 'IcL' (each node station knows the time it takes to go around the loop 8 of the 113TsubuptukTM. From this point on, the timer (To -T+) sends out the signal 7μts addressed to the other]-tostation. Tonah Nil VC
Once completed, this signal block will not be interfered with by synchronization No. 16.

Figure 4 shows the loop interface section of each node station used in this embodiment, and Figure 5 shows the configuration of the signal 7' ptsu.
As shown in the figure. The loop ink face part in Figure 4 is loop 8.
Human power D+f −f i o connected to output terminal 11
and a switch 12. Buffer 13, transmission buffer 14. Constraint -11 circuit 15. J8. Synchronous signal→t detection circuit 16. It consists of a timer 17.

FIG. 5(a) shows the configuration of the synchronization signal F, including pre-purinful PR, start flag 8F, synchronization filler) SY, and end flag E.
It is composed of F. Hit5Y=1 indicates that it is a synchronization signal. FIG. 5(b) shows Flock TM No. 18, to which destination 7 trace DA and sender address SA are added. FIG. 5(e) is a signal block for communication between nodes, and an information field INFO is added to the history. In addition, the signal block in FIG. 5 (bi, (e)) is bit 5y.
7+- at -o, the timer 17 is detected in the synchronization signal detection circuit 16 (1 pip shown in al) SY=10
It operates in synchronization with the fat signal FK, and its output is 1 (i [i
l: Supplied to i paths 15 and 18. When the control circuit 15 is initialized by the control object '@19, a U signal is sent to the transmission buffer 14.

Fig. 5 (Stores the signal block TM of bl. Note that the destination 7 address 1 of this signal block 1゛M) A and the address SA of the ge 3 reader are both set to the own address. i!
The i control circuit 15 has a loop 8 supplied from the buffer 13.
When the end flag EF is detected, the switch 12 is turned on to the transmission buffer 14@i1.
Turn to N and start transmitting 1.1 from IL. Bria〉Full P R statement (7+)〉In the upper section, the signal flock's Nori 7 full is j, IIf4! ;:;
1) When you take it out, switch 12 will go to the roof.
ll +1. : Otoko, i-gu, Shin, bamboo, fossil 1 stone. Then, after waiting for the completion flag EF of this Toki No. Futonok to pass, the control of 1 is repeated, and while the pre-7 full PR of the I No. Futsuku TM is being sent, another signal block is sent from Ni Huffer 13. When the preamplifier is not supplied, it acquires the transmission right and outputs the sag of the signal block TM for '#5ii. 1lill lr'1 circuit 15G''! ,
, the output of the timer 17 is smaller than TL ℃・bar (O) The above-mentioned sending or 1'' is performed, but 'rL, t increases (t, r, this control flil is stopped, and the next time j) 5 ( Pt 9j
Wait for F to pass before restarting. Timer 17 returns TL and t (if the right to transmit Ilr is acquired, 7) [J
This signal block IM goes around loop 8, and the total number of songs τ1 is 00:8 at the moment it is received.
Ii・i- do. This signal τ is derived from the difference between the output value of the signal block '1' output IIq and the output value of the signal block '1' and the output value of the signal block '17'. [Restriction 1 circuit] 5 is the stone that informs the first measurement J and the time T1 to control C@・lj,,j path 18. 1, 5, switch 1z & J Kakushin ends and loop 8 returns to Tori Town. Control circuit 18 is controlled @
1.! Even if it is initialized by -4419 in , it does not start up immediately, but waits for notification of time τ from the control circuit 15 and then starts up. The control circuit 1818 stores the signal in the signal block transmission buffer 14 as shown in FIG.

Just L, control times y? Transmission control in 118 is performed by timer 1.
This is performed only until the output of 7 becomes (To-TI).

Further, when the timer reaches (°l゛.-), ) during the transmission, the transmission 8 is ended.

A second embodiment of the present invention will be explained using FIG. 1, FIG. 6, and FIG. 7. Figure 6 shows the signal on the roof 8, and the 7th
The figure shows a signal block used in this embodiment. This signal block is a signal block with a priority bit P@, )'1 indicating the priority added to No. 48 in FIG. 5, and FIG. No. 1. Signal 70ts TM and No. 1h block for inter-node communication. A brief explanation of the priority control in this embodiment will be given. - Send out the cyclic waste @F. This synchronous IJ number F has bit 5Y = 1 and is the highest priority, buoy communication, for example, Fa to trigger synchronous communication such as 1 voice communication. xpl-0.The cross station 7 is exactly the same as the node station transfer 1δ-shin acquisition system XI shown in the first embodiment: 'l1l
When the transmission right is acquired within the period Te by Cape l, 5Y-0
, Pa =0. Send the trigger 1Ff PRI of P+-1, and then activate the priority retroactive trigger. Similarly, the trigger 1 of the priority key P・=1, P, -0
Trigger signal PR2, Pa = P, -1 trigger signal P is sent out. Each node sludge monitors the bride priority bits Pa and P+ of the signal flocks passing through, including synchronization number 16 and trigger (number 1), and the priority level of its own sending 4-power signal flock is (pe, p+). If the priority level is equal to or higher than the given priority level,
This <S number flock is sent out. It should be noted that the priority bits P. and P+ of this signal block follow the bits Pa and Pa of the number Fromek that passed directly.

In the above priority control, the signal block TM
For the second priority < (Pa Jl, Pt-1
(corresponds to ) to 49. Therefore, for example, when the node station 5 tries to send out the signal ZutsukTM, the fifth
As shown in the figure, after the trigger signal RRI passes, the transmission right is
Get it and send it out. Since this transmission is performed prior to the communication triggered by the trigger signals PR2 and PR3, /-
Tosschiran 5 can quickly learn the propagation delay time 7:I of loop 8. By knowing the time, communication between nodes can be performed. Therefore, as shown in Fig.
can be sent. In addition, in FIG. 5, signal blocks B1, B7. B U and B are the signals 7 sent from node station 1.2.6.3 respectively.
-Shows a tsuku.

The operation of the loop ink face portion of each node station in this embodiment will be explained using FIG. 4. The control circuit 15, activated by the control signal 19, receives the bits 87 and 87 supplied from the buffer 13;
When Pt-1 is detected, the same transmission stock I acquisition control as in the first embodiment is started, and when the transmission stock r is monopolized, buffer 1 is
The stone 1 control circuit 15, which sends out the signal progger M stored in the block 4 to the output terminal 11 via the switch 12, notifies the control circuit 18 when the section T is measured. The power control circuit 18 is also activated in response to this notification. Hereinafter, communication between nodes will be performed in the same manner as in the first embodiment.

In the first and second embodiments, after the timer 17 outputs (T, -), the communication is terminated by percentage control, but at time r+rIτ. It is also possible to provide a margin of 2 and end the communication after outputting (T11-ατH-near:e).

In this way, according to the invention, the loop delay time can be known in advance of inter-node communication, which is also useful, and it is possible to prevent signal blocks in inter-node communication from being interfered with by synchronization signals. It is possible to provide smooth communication services.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a node network, Figure 2 is a diagram showing the timing IMo in a conventional loop network, and Figure 3 is a diagram showing a node network.
FIG. 6 (timing diagram for the first and second embodiments of the civil engineering invention; 5F2+ and 77 are diagrams showing the configuration of signal blocks used in the first and second embodiments; FIG. 4 is a timing diagram for the first and second embodiments). It is a block diagram showing the loop interface part of the second embodiment trap-using monode station 1. In FIGS. 1 and 4, 1.2.3.4.5.6 is a node stage gin, 7 indicates the clock stage, 8 indicates the loop, 13.14 indicates the buffer, 15.18 indicates the control circuit, 16 indicates the synchronization signal detection circuit, and 17 indicates the timer.

Claims (1)

[Claims] One clock station is composed of 4 node stations, and the clock station sends out a synchronizing signal to the roots during 15j cycles, and the node station is connected to the +ii1
It has a timer that operates as soon as the Eisen passes, and also has a timer that operates when the Eisen passes, and also has a timer for detecting the loop propagation time.
7. Input data 1, (・) 1-B propagation field 5 was detected, and then Note 1 was detected between 3 and 3 Jif1.
Send for pcs jhl+? Ill' to 1 piece 1, node station 1Mi communication (H ℃・ is sent I 1-Reichi/j4 system, turn, cut) iri・fl or Ojj loop transmission h2 from the above period・Tokukai te, = shihiki ℃・taB,
f time, I) 7: Or, after outputting the time obtained by subtracting a certain margin time from the nf time, it is output (ij or sending Ih Park / without stopping the acquisition control jl:j'C'a A communication control method in a loop network.